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133-633: Informal studies as early as 1906 covered a number of possibilities, from basing at Gibraltar or Singapore (an idea revived by the British before World War II) to "a quick trans-Atlantic dash" to the Pacific. The plan eventually adopted was conceived by Rear Admiral Raymond P. Rodgers in 1911. The plan was formally adopted by the Joint Army and Navy Board beginning in 1924. Predating the Rainbow plans , which presumed

266-471: A 2002 referendum . Nevertheless, Gibraltar maintains close economic and cultural links with Spain, with many Gibraltarians speaking Spanish as well as a local dialect known as Llanito . Gibraltar's economy rests on financial services, e-gaming, tourism and the port. With one of the world's lowest unemployment rates, the largest part of the labour force are resident in Spain or non-Gibraltarians, especially in

399-561: A British citizen (" an entitlement that cannot be refused ") under section 5 of the Act. Under the subsequent British Overseas Territories Act 2002 , all British Overseas Territories citizens became British citizens on 21 May 2002. Gibraltar is not a sovereign state: its formal international relations are the responsibility of the Government of the United Kingdom. Since Brexit, it is not part of

532-570: A fleet action against the weakened US fleet in a "decisive battle area", near Japan, also in line with Mahanian doctrine, which Japan had enthusiastically embraced. It was the basis for Japan's demand for a 70% ratio (10:10:7) at the Washington Naval Conference , which was considered necessary to provide Japan superiority in the "decisive battle area" (taking into account that the US had naval commitments in other theaters, while Japan did not). It

665-586: A fleet submarine with high speed, long range, and heavy torpedo armament. These coalesced in the submarine Dolphin in 1932 (only to be rejected and returned to with the Gato class in around August 1941). The demand for submarines of this size also drove the development of the notoriously problematic Mark 14 torpedo (and its equally notorious Mark VI exploder ), under the guidance of Commander Ralph W. Christie . The Navy also spent "several hundred thousand dollars" to develop powerful, compact diesel engines, among them

798-521: A 1.2 km (0.75 mi) land border with Spain. The town of La Línea de la Concepción , a municipality of the province of Cádiz , lies on the Spanish side of the border. The Spanish hinterland forms the comarca of Campo de Gibraltar (literally "Countryside of Gibraltar"). The shoreline measures 12 km (7.5 mi) in length. There are two coasts ("Sides") of Gibraltar: the East Side, which contains

931-417: A 35–40 lb (16–18 kg) cone-shaped steel drum on a 5 ft (1.5 m) shaft, intended to be thrown at a submarine. Firing Lyddite shells, or using trench mortars , was tried. Use of nets to ensnare U-boats was also examined, as was a destroyer, HMS  Starfish , fitted with a spar torpedo . To attack at set depths, aircraft bombs were attached to lanyards which would trigger their charges;

1064-549: A bid for city status as part of the Platinum Jubilee Civic Honours . The bid was refused, but when researchers looked through the National Archives , they found that it had already been recognised as a city by Queen Victoria in 1842. The status came into force on 29 August 2022. Under its current constitution , Gibraltar has almost complete internal self-governance through a parliament elected for

1197-462: A comparable WW2 submarine; in addition, they recharged their batteries using a snorkel and could complete a patrol without surfacing. This led to the introduction of longer-ranged forward-throwing weapons, such as Weapon Alpha , Limbo , RBU-6000 , and of improved homing torpedoes. Nuclear submarines , even faster still, and without the need to snorkel to recharge batteries, posed an even greater threat; in particular, shipborne helicopters (recalling

1330-403: A device intended for countermining , a "dropping mine". At Admiral John Jellicoe 's request, the standard Mark II mine was fitted with a hydrostatic pistol (developed in 1914 by Thomas Firth & Sons of Sheffield) preset for 45 ft (14 m) firing, to be launched from a stern platform. Weighing 1,150 lb (520 kg), and effective at 100 ft (30 m), the "cruiser mine"

1463-410: A large role. The use of nuclear propulsion and streamlined hulls has resulted in submarines with high speed capability and increased maneuverability, as well as low "indiscretion rates" when a submarine is exposed on the surface. This has required changes both to the sensors and weapons used for ASW. Because nuclear submarines were noisy, there was an emphasis on passive sonar detection. The torpedo became

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1596-407: A large, modern submarine fleet, because all had fallen in the grip of Mahanian doctrine which held guerre de course could not win a war. At the beginning of the conflict, most navies had few ideas how to combat submarines beyond locating them with sonar and then dropping depth charges on them. Sonar proved much less effective than expected, and was no use at all against submarines operating on

1729-703: A long tail boom (fixed-wing aircraft) or an aerodynamic housing carried on a deployable tow line (helicopters). Keeping the sensor away from the plane's engines and avionics helps eliminate interference from the carrying platform. At one time, reliance was placed on electronic warfare detection devices exploiting the submarine's need to perform radar sweeps and transmit responses to radio messages from home port. As frequency surveillance and direction finding became more sophisticated, these devices enjoyed some success. However, submariners soon learned not to rely on such transmitters in dangerous waters. Home bases can then use extremely low frequency radio signals, able to penetrate

1862-642: A meeting with their American counterparts in June 1917. In October 1918, there was a meeting in Paris on "supersonics", a term used for echo-ranging, but the technique was still in research by the end of the war. The first recorded sinking of a submarine by depth charge was U-68 , sunk by Q-ship HMS  Farnborough off County Kerry , Ireland 22 March 1916. By early 1917, the Royal Navy had also developed indicator loops which consisted of long lengths of cables lain on

1995-596: A minimum in the meantime. As of March 2023 , talks remain stalled, with Spain insisting that its Policía Nacional control entry into the Schengen area and the UK demanding that the work be done by officers of the European Union agency Frontex . All other entry points to the Schengen area are controlled by national authorities, supplemented by Frontex in some places. Gibraltar's territory covers 6.8 km2 (2.6 sqmi) and shares

2128-524: A place of religious and symbolic importance. The Phoenicians were present for several centuries since around 950 BC, apparently using Gorham's Cave as a shrine to the genius loci , as did the Carthaginians and Romans after them. Gibraltar was known as Mons Calpe , a name perhaps of Phoenician origin. Mons Calpe was considered by the ancient Greeks and Romans as one of the Pillars of Hercules , after

2261-476: A potential agreement that would see them sharing sovereignty over Gibraltar. The government of Gibraltar organised a referendum on the plan, and 99% of the population voted to reject it. In 2008, the British government committed to respecting the Gibraltarians' wishes. A new Constitution Order was approved in referendum in 2006. A process of tripartite negotiations started in 2006 between Spain, Gibraltar and

2394-558: A preemptive strike from the Japanese. In particular, they did not yet know either that aircraft would be able to effectively sink battleships or that Japan might put the American battleship force (the Battle Line) out of action at a stroke, which actually happened at Pearl Harbor on December 7, 1941 . American plans changed after this attack. Even after major Japanese defeats like Midway , once

2527-684: A raid in 710, a predominantly Berber army under the command of Tariq ibn Ziyad crossed from North Africa in April 711 and landed somewhere in the vicinity of Gibraltar (though most likely not in the bay or at the Rock itself). Tariq's expedition led to the Islamic conquest of most of the Iberian peninsula . Mons Calpe was renamed Jabal Ṭāriq ( جبل طارق ), "the Mount of Tariq", subsequently corrupted into Gibraltar . In 1160

2660-561: A ram with which to sink submarines, and U-15 was thus sunk in August 1914. During June 1915, the Royal Navy began operational trials of the Type D depth charge, with a 300 lb (140 kg) charge of TNT ( amatol , as TNT supplies became critical) and a hydrostatic pistol, firing at either 40 or 80 ft (12 or 24 m), and believed to be effective at a distance of 140 ft (43 m);

2793-508: A rear base, the fleet would no longer be superior to Orange's. Given the agreements barring fortification of Far Eastern bases, only Pearl Harbor could repair U.S capital ships. Sending them back to Hawaii would forfeit the Far East to the Japanese. Despite this, the strategy followed by the U.S. in the Pacific War differed little from Rodgers' concept from 1911: a "leapfrog" campaign to conquer

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2926-502: A report by the World Health Organization showed that Gibraltar had the worst air quality in any British territory. The report concentrated on PM10 and PM2.5 pollutants in the air. Gibraltar's economy is dominated by four main sectors: financial services , online gambling , shipping, and tourism, which includes duty-free retail sales to visitors. The British military traditionally dominated Gibraltar's economy , with

3059-415: A result, in the latter half of 1943, US subs were suddenly sinking Japanese ships at a dramatically higher rate, scoring their share of key warship kills and accounting for almost half of the Japanese merchant fleet. Japan's naval command was caught off guard; Japan had neither the anti-submarine technology or doctrine, nor the production capability to withstand a tonnage war of attrition , nor did she develop

3192-594: A semi-autonomous oceangoing unmanned naval vessel. Today some nations have seabed listening devices capable of tracking submarines. It is possible to detect man-made marine noises across the southern Indian Ocean from South Africa to New Zealand. Some of the SOSUS arrays have been turned over to civilian use and are now used for marine research. Several countries developed anti-submarine missiles including United States , Russia , China , South Korea , Japan and India . Anti-submarine missiles give flexibility in terms of

3325-560: A ship by an underwater vehicle are generally believed to have been during the American Revolutionary War , using what would now be called a naval mine but what was then referred to as a torpedo. Even so, various attempts to produce submarines had been made prior to this. In 1866, British engineer Robert Whitehead invented the first effective self-propelled torpedo, the eponymous Whitehead torpedo ; French and German inventions followed soon thereafter. The first submarine with

3458-499: A similar idea was a 16 lb (7.3 kg) guncotton charge in a lanyarded can; two of these lashed together became known as the Depth Charge Type A. Problems with the lanyards tangling and failing to function led to the development of a chemical pellet trigger as the Type B. These were effective at a distance of around 20 ft (6.1 m). Perhaps the best early concept arose in a 1913 RN Torpedo School report, describing

3591-500: A term of up to four years. The unicameral parliament presently consists of 17 elected members, and the Speaker who is not elected but appointed by a resolution of the parliament. The government consists of 10 elected members. The head of state is the British monarch King Charles III , who is represented by the Governor of Gibraltar . The governor enacts day-to-day matters on the advice of

3724-706: A torpedo was Nordenfelt I built in 1884–1885, though it had been proposed earlier. By the outbreak of the Russo-Japanese War , all the large navies except the Germans had acquired submarines. Nevertheless, by 1904, all powers still defined the submarine as an experimental vessel and did not put it into operational use. There were no means to detect submerged U-boats, and attacks on them were limited at first to efforts to damage their periscopes with hammers. The Royal Navy torpedo establishment, HMS Vernon , studied explosive grapnel sweeps; these sank four or five U-boats in

3857-643: Is bordered to the north by Spain ( Campo de Gibraltar ). The landscape is dominated by the Rock of Gibraltar , at the foot of which is a densely populated town area, home to some 34,003 people, primarily Gibraltarians . Gibraltar was founded as a permanent watchtower by the Almohads in 1160. It switched control between the Nasrids , Castilians and Marinids in the Late Middle Ages , acquiring larger strategic clout upon

3990-639: Is British government policy not to engage in talks about the sovereignty of Gibraltar without the consent of the people of Gibraltar. Gibraltar was part of the European Union , having joined through the European Communities Act 1972 (UK) , which gave effect to the Treaty of Accession 1972 , as a dependent territory of the United Kingdom under what was then article 227(4) of the Treaty Establishing

4123-539: Is a branch of underwater warfare that uses surface warships , aircraft , submarines , or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades . Successful ASW operations typically involved a combination of sensor and weapon technologies, along with effective deployment strategies and sufficiently trained personnel. Typically, sophisticated sonar equipment

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4256-716: Is not a member of the Commonwealth of Nations in its own right and is represented by the United Kingdom but was granted Associate Membership of the Commonwealth Foundation in 2004. Gibraltar has competed in the Commonwealth Games since 1958. As a result of the British Nationality Act 1981 , Gibraltarians were made British Overseas Territories citizens by default, but could apply for registration as

4389-527: Is regarded as having been responsible for setting the old town's style, described by Claire Montado, chief executive of the Gibraltar Heritage Trust, as "military-ordnance-style arched doorways, Italianate stucco relief, Genoese shutters, English Regency ironwork balconies, Spanish stained glass and Georgian sash and casement windows." During the Napoleonic Wars , Gibraltar became a key base for

4522-454: Is used for first detecting, then classifying, locating, and tracking a target submarine. Sensors are therefore a key element of ASW. Common weapons for attacking submarines include torpedoes and naval mines , which can both be launched from an array of air, surface, and underwater platforms. ASW capabilities are often considered of significant strategic importance, particularly following provocative instances of unrestricted submarine warfare and

4655-484: The R1 was the first ASW submarine. 211 of the 360 U-boats were sunk during the war, from a variety of ASW methods: This period saw the development of active sonar ( ASDIC ) and its integration into a complete weapons system by the British, as well as the introduction of radar . During the period, there was a great advance due to the introduction of electronics for amplifying, processing, and displaying signals. In particular,

4788-548: The 1967 Gibraltar sovereignty referendum , which led to the passing of the Gibraltar Constitution Order in 1969. In response, Spain completely closed the border with Gibraltar and severed all communication links. The border with Spain was partially reopened in 1982 and fully reopened in 1985 before Spain's accession to the European Community . In the early 2000s, Britain and Spain were in negotiations over

4921-488: The Admiralty . To attack submerged boats, a number of anti-submarine weapons were derived, including the sweep with a contact-fused explosive. Bombs were dropped by aircraft and depth charge attacks were made by ships. Prior to the introduction of dedicated depth charge throwers, charges were manually rolled off the stern of a ship. The Q-ship , a warship disguised as a merchantman, was used to attack surfaced U-boats, while

5054-646: The Almohad Sultan Abd al-Mu'min ordered that a permanent settlement, including a castle, be built. It received the name of Medinat al-Fath (City of the Victory). The Tower of Homage of the Moorish Castle remains standing today. From 1274 onwards, the town was fought over and captured by the Nasrids of Granada (in 1237 and 1374), the Marinids of Fez (in 1274 and 1333) and the kings of Castile (in 1309). Upon

5187-571: The Emirate of Granada . After the conquest, Henry IV of Castile assumed the additional title of King of Gibraltar , establishing it as part of the comarca of the Campo Llano de Gibraltar . Six years later, Gibraltar was restored to the Duke of Medina Sidonia, who sold it in 1474 to a group of 4,350 conversos (Christian converts from Judaism) from Cordova and Seville and in exchange for maintaining

5320-730: The European Parliament as part of the South West England constituency . On 23 June 2016 Gibraltar voted along with the United Kingdom in the EU referendum ; 96% of its population voted to remain, but the overall United Kingdom result gave a 51.9% majority to leaving the EU. Nevertheless, Spanish Prime Minister Pedro Sánchez stated on 18 October 2018 that the Gibraltar protocol had been "resolved" and that Spain will hold no objection when Gibraltar leaves

5453-636: The Grand Alliance , captured the town of Gibraltar on behalf of the Archduke Charles of Austria in his campaign to become King of Spain. Subsequently, most of the population left the town, with many settling nearby. As the Alliance's campaign faltered, the 1713 Treaty of Utrecht was negotiated, which ceded control of Gibraltar to Britain to secure Britain's withdrawal from the war. Unsuccessful attempts by Spanish monarchs to regain Gibraltar were made, with

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5586-602: The Greek legend of the creation of the Strait of Gibraltar by Heracles . There is no known archaeological evidence of permanent settlements from the ancient period. They settled at the head of the bay in what is today known as the Campo (hinterland) of Gibraltar . The town of Carteia , near the location of the modern Spanish town of San Roque , was founded by the Phoenicians around 950 BC on

5719-669: The Neolithic period have been found in Gibraltar's caves, mostly of types typical of the Almerian culture found elsewhere in Andalusia , especially around the town of Almería , from which it takes its name. There is little evidence of habitation in the Bronze Age when people had largely stopped living in caves. During ancient times, Gibraltar was regarded by the peoples of the Mediterranean as

5852-547: The Progressive Democratic Party (PDP). The PDP was a new party, formed in 2006 and fielded candidates in the 2007 election, but none were elected. The head of government is the Chief Minister (as of December 2011 , Fabian Picardo ). All local political parties oppose any transfer of sovereignty to Spain, instead supporting self-determination . The main UK opposition parties also support this policy, and it

5985-533: The Royal Navy and played an important role leading up to the Battle of Trafalgar (21 October 1805). Designated one of four Imperial fortresses (along with Halifax, Nova Scotia , Bermuda , and Malta ), its strategic location made it a key base during the Crimean War of 1854–1856. In the 18th century, the peacetime military garrison fluctuated in numbers from a minimum of 1,100 to a maximum of 5,000. The first half of

6118-581: The Second World War , the Allies developed a huge range of new technologies, weapons and tactics to counter the submarine danger. These included: Italian and German submarines operated in the Mediterranean on the Axis side while French and British submarines operated on the side of the Allies. The German Navy sent 62 U-boats to the Mediterranean; all were lost in combat or scuttled. German subs first had to pass through

6251-574: The Whiskey and Zulu classes. Britain also tested hydrogen peroxide fuels in Meteorite , Excalibur , and Explorer , with less success. To deal with these more capable submarines new ASW weapons were essential. This new generation of diesel electric submarine, like the Type XXI before it, had no deck gun and a streamlined hull tower for greater underwater speed, as well as more storage battery capacity than

6384-502: The Wolfpack achieved initial success, but became increasingly costly as more capable ASW aircraft were introduced. Technologies such as the Naxos radar detector gained only a temporary reprieve until detection apparatus advanced yet again. Intelligence efforts, such as Ultra , had also played a major role in curtailing the submarine threat and guiding ASW efforts towards greater success. During

6517-469: The blimps of World War I) have emerged as essential anti-submarine platforms. A number of torpedo carrying missiles such as ASROC and Ikara were developed, combining ahead-throwing capability (or longer-range delivery) with torpedo homing. Since the introduction of submarines capable of carrying ballistic missiles , great efforts have been made to counter the threat they pose; here, maritime patrol aircraft (as in World War II) and helicopters have had

6650-403: The narrow entrance and exit to the Mediterranean Sea , the Strait of Gibraltar , with half the world's seaborne trade passing through it. The sovereignty of Gibraltar is a point of contention in Anglo-Spanish relations as Spain asserts a claim to the territory . Gibraltarians overwhelmingly rejected proposals for Spanish sovereignty in a 1967 referendum , and for shared sovereignty in

6783-408: The naval dockyard providing the bulk of economic activity. This, however, has diminished over the last 20 years and is estimated to account for only 7 per cent of the local economy, compared to over 60 per cent in 1984. The territory also has a small manufacturing sector, representing a bit less than 2 per cent of the economy. Gibraltar's labour market employs around thirty thousand workers, 80% in

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6916-491: The postwar era, ASW continued to advance, as the arrival of nuclear submarines had rendered some traditional techniques less effective. The superpowers of the era constructed sizable submarine fleets, many of which were armed with nuclear weapons ; in response to the heightened threat posed by such vessels, various nations chose to expand their ASW capabilities. Helicopters , capable of operating from almost any warship and equipped with ASW apparatus, became commonplace during

7049-432: The siege of 1727 , and again with the Great Siege of Gibraltar (1779 to 1783), during the American War of Independence . After the destructive Great Siege, the town was almost entirely rebuilt. Giovanni Maria Boschetti, who arrived in Gibraltar in 1784 as a 25-year-old from Milan, where he is thought to have been a stonemason or engineer, built the Victualling Yard (completed in 1812) and many other buildings. Boschetti

7182-428: The "life and death" urgency in the Atlantic. However, US Vice Admiral Charles A. Lockwood pressured the ordnance department to replace the faulty torpedoes; famously when they initially ignored his complaints, he ran his own tests to prove the torpedoes' unreliability. He also cleaned out the "deadwood", replacing many cautious or unproductive submarine skippers with younger (somewhat) and more aggressive commanders. As

7315-417: The "range recorder" was a major step that provided a memory of target position. Because the propellers of many submarines were extremely loud in the water (though it doesn't seem so from the surface), range recorders were able to gauge the distance from the U-boat by sound. This would allow mines or bombs around that area to be detonated. New materials for sound projectors were developed. Both the Royal Navy and

7448-492: The 1933 Operations IV Wargame , which resulted in defeat for a hypothetical blue fleet meant to symbolize a US Philippine relief force, War Plan Orange was revised to account for a more steady, methodical advance in order to take Japanese strongpoints in the Marshall Islands . This was done in accordance to observations that both stretched logistical capacity in the "through ticket to the Philippines" strategy, and inability to repair damaged vessels, allowed Japan to gain command of

7581-526: The 1960s. Increasingly capable fixed-wing maritime patrol aircraft were also widely used, capable of covering vast areas of ocean. The Magnetic Anomaly Detector (MAD), diesel exhaust sniffers , sonobuoys and other electronic warfare technologies also became a staple of ASW efforts. Dedicated attack submarines , purpose-built to track down and destroy other submarines, became a key component as well. Torpedo carrying missiles, such as ASROC and Ikara , were another area of advancement. The first attacks on

7714-443: The 19th century saw a significant increase of population to more than 17,000 in 1860, as people from Britain and all around the Mediterranean – Italian, Portuguese, Maltese, Jewish and French – took up residence in the town. Its strategic value increased with the opening of the Suez Canal , as it lay on the sea route between the UK and the British Empire east of Suez. In the later 19th century, major investments were made to improve

7847-587: The 8th-century North African military leader Tariq ibn Ziyad , who began the Muslim conquest of the Iberian Peninsula via the Strait of Gibraltar in 711). Evidence of Neanderthal habitation in Gibraltar from around 50,000 years ago has been discovered at Gorham's Cave . The caves of Gibraltar continued to be used by Homo sapiens after the final extinction of the Neanderthals. Stone tools, ancient hearths and animal bones dating from around 40,000 years ago to about 5,000 years ago have been found in deposits left in Gorham's Cave. Numerous potsherds dating from

7980-558: The Allied merchant convoys and strategic shipping lanes to any degree that German U-boats did. One major advantage the Allies had was the breaking of the Japanese "Purple" code by the US, so allowing friendly ships to be diverted from Japanese submarines and allowing Allied submarines to intercept Japanese forces. In 1942 and early 1943, US submarines posed little threat to Japanese ships, whether warships or merchant ships. They were initially hampered by poor torpedoes, which often failed to detonate on impact, ran too deep, or even ran wild. As

8113-416: The EU continued unchanged until the end of 2020 when it was replaced by the EU–UK Trade and Cooperation Agreement . On 31 December 2020, the UK and Spain agreed in principle on a basis for the EU and the UK to negotiate an agreement through which Gibraltar would participate in the Schengen Area , to avoid a hard border with Spain. The arrangements have not entered into force. In 2022, Gibraltar launched

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8246-422: The EU with Britain. Gibraltar was nominated to be included on the United Nations list of non-self-governing territories by the United Kingdom when the list was created in 1946 and has been listed ever since. The government of Gibraltar has actively worked to have Gibraltar removed from the list, and in 2008 the British government declared Gibraltar's continued presence on the list an anachronism. Gibraltar

8379-423: The European Community covering special member state territories , with exemption from some areas such as the European Union Customs Union , Common Agricultural Policy and the Schengen Area . It is the only British Overseas Territory which was part of the European Union. After a 10-year campaign for the right to vote in European elections , from 2004 to 2019 the people of Gibraltar participated in elections for

8512-409: The European Union, but is a participant in the EU–UK Trade and Cooperation Agreement . On 31 December 2020, the UK and Spain agreed in principle on a basis for the EU and the UK to negotiate an agreement through which Gibraltar would participate in the Schengen Area , to avoid a hard border with Spain. The arrangements have not entered into force, but both sides aim to keep delays at the border at

8645-405: The First World War. A similar approach featured a string of 70 lb (32 kg) charges on a floating cable, fired electrically; an unimpressed Admiral Edward Evans considered any U-boat sunk by it deserved to be. Another primitive technique of attacking submarines was the dropping of 18.5 lb (8.4 kg) hand-thrown guncotton bombs. The Lance Bomb was developed, also; this featured

8778-452: The Gibraltar Parliament but is responsible to the British government in respect of defence, foreign policy, internal security and general good governance. Judicial and other appointments are made on behalf of the monarch in consultation with the head of the elected government . The 2011 election was contested by the Gibraltar Social Democrats (GSD), Gibraltar Socialist Labour Party (GSLP)- Liberal Party of Gibraltar (LPG) Alliance and

8911-420: The Iberian peninsula because of its position on the Strait of Gibraltar. Rain occurs mainly in winter, with summer being generally dry. Its average annual temperature is 21.7 °C (71.1 °F) as a daily high and 15.8 °C (60.4 °F) as the overnight low. In the coldest month, January, the high temperature averages 16.3 °C (61.3 °F) and the overnight low averages 11.2 °C (52.2 °F) and

9044-461: The Marshalls and Carolines (held by Japan before the war); liberation of the Philippines; and blockade. Absent was the "decisive battle" of Mahan, and of Japanese planning. In accordance with the Kantai Kessen naval strategy, the Imperial Japanese Navy developed its own plan that allowed the US Pacific Fleet to sail across the Pacific while the IJN would use submarines and carrier attacks to weaken it. The Japanese fleet would then attempt to force

9177-474: The Nasrid destruction and abandonment of Algeciras c.  1375 and Nasrids' procurement of Gibraltar away from Marinids in 1375, the Nasrids favoured Gibraltar (a worse natural harbor than Algeciras but featuring better defence capabilities) as a military and urban outpost in the Strait, although Gibraltar did not ever reach a large population during this period. In 1462, Gibraltar was captured by Juan Alonso de Guzmán, 1st Duke of Medina Sidonia , from

9310-454: The Navy developed and introduced the Kyushu Q1W anti-submarine bomber into service in 1945. The Japanese depth charge attacks by its surface forces initially proved fairly unsuccessful against U.S. fleet submarines. Unless caught in shallow water, a U.S. submarine commander could normally escape destruction, sometimes using temperature gradients ( thermoclines ). Additionally, IJN doctrine emphasized fleet action, not convoy protection, so

9443-437: The Pacific, mainly against coastal shipping. In the immediate postwar period, the innovations of the late war U-boats were quickly adopted by the major navies. Both the United Kingdom and The United States studied the German Type XXI and used the information to modify WW2 fleet boats, the US with the GUPPY program and the UK with the Overseas Patrol Submarines Project. The Soviets launched new submarines patterned on Type XXIs,

9576-580: The Rock before British control, having possibly been introduced during the Islamic period. A superstition analogous to that of the ravens at the Tower of London states that if the apes ever leave, so will the British. In 1944, British Prime Minister Winston Churchill was so concerned about the dwindling population of apes that he sent a message to the Colonial Secretary requesting that something be done about

9709-586: The Rock. Gibraltar is the only place in Europe where the Gibraltar candytuft ( Iberis gibraltarica ) is found growing in the wild; the plant is otherwise native to North Africa. It is the symbol of the Upper Rock nature reserve . Olive and pine trees are among the most common of those growing around the Rock. Most of the Rock's upper area is covered by a nature reserve which is home to around 230 Barbary macaques ,

9842-621: The Type D*, with a 120 lb (54 kg) charge, was offered for smaller ships. In July 1915, the British Admiralty set up the Board of Invention and Research (BIR) to evaluate suggestions from the public as well as carrying out their own investigations. Some 14,000 suggestions were received about combating submarines. In December 1916, the RN set up its own Anti-Submarine Division (ASD), from which came

9975-409: The U.S. Navy fitted their destroyers with active sonars. In 1928, a small escort ship was designed and plans made to arm trawlers and to mass-produce ASDIC sets. Several other technologies were developed; depth sounders that allowed measurement by moving ships were a new innovation, along with a greater appreciation of the properties of the ocean that affected sound propagation. The bathythermograph

10108-561: The UK, ending some restrictions and dealing with disputes in some specific areas such as air movements, customs procedures, telecommunications, pensions and cultural exchange. In the British referendum on membership of the European Union 96% of Gibraltarians voted to remain on an 84% turnout. Spain renewed calls for joint Spanish–British control of the peninsula; these were strongly rebuffed by Gibraltar's Chief Minister. On 18 October 2018, however, Spain seemed to have reached an agreement with

10241-533: The US submarine menace was slight in the beginning, Japanese commanders became complacent and as a result did not invest heavily into ASW measures or upgrade their convoy protection to any degree to what the Allies in the Atlantic did. Often encouraged by the Japanese not placing a high priority on the Allied submarine threat, US skippers were relatively complacent and docile compared to their German counterparts, who understood

10374-505: The United Kingdom in relation to its objections to Gibraltar leaving the EU with the UK, with Spain's prime minister Pedro Sánchez stating, "Gibraltar will no longer be a problem in arriving at a Brexit deal." On 31 January 2020, the UK left the European Union and consequently so did Gibraltar. Under the terms of the transition phase in the Brexit withdrawal agreement , Gibraltar's relationship with

10507-747: The assistance of allies , Orange assumed that the United States would fight Japan alone. As originally conceived, it anticipated a blockade of the Philippines and other U.S. outposts in the western Pacific. They were expected to hold out on their own while the Pacific Fleet marshaled its strength at bases in California and Hawaii and guarded against attacks on the Panama Canal . After mobilization (the ships maintained only half of their crews in peacetime),

10640-463: The average sea temperature is 16 °C (61 °F). In the warmest month, August, the daily high temperature averages 28.4 °C (83.1 °F), the overnight low averages 21.2 °C (70.2 °F), and the average sea temperature is 22 °C (72 °F). Source 3: Meteoclimat (records except February, July and August record lows) Source 4: Time and Date (dew points and humidity) Over 500 different species of flowering plants grow on

10773-487: The best ships and crews went elsewhere. Moreover, during the first part of the war, the Japanese tended to set their depth charges too shallow, unaware U.S. submarines could dive below 150 feet (45m). Unfortunately, this deficiency was revealed in a June 1943 press conference held by U.S. Congressman Andrew J. May , and soon enemy depth charges were set to explode as deep as 250 feet (76m). Vice Admiral Charles A. Lockwood , COMSUBPAC , later estimated May's revelation cost

10906-437: The boreholes is nowadays supplemented by two desalination plants: a reverse osmosis plant, constructed in a tunnel within the rock, and a multi-stage flash distillation plant at North Mole. Gibraltar's terrain consists of the 426 m-high (1,398 ft) Rock of Gibraltar made of Jurassic limestone , and the narrow coastal lowland surrounding it. It contains many tunnelled roads, most of which are still operated by

11039-588: The destruction of nearby Algeciras c.  1375 . It became again part of the Crown of Castile in 1462. In 1704, Anglo-Dutch forces captured Gibraltar from Spain during the War of the Spanish Succession , and it was ceded to Great Britain in perpetuity under the Treaty of Utrecht in 1713. It became an important base for the Royal Navy , particularly during the Napoleonic Wars and World War II , as it controlled

11172-519: The early part of the Pacific War, Japanese subs scored several tactical victories, three successful torpedo strikes on the US fleet carriers Yorktown (CV-5), USS  Saratoga and USS  Wasp (CV-7), The Saratoga survived the attack and was repaired, while the Yorktown and Wasp were both abandoned and scuttled as a result of the attack. The USS North Carolina (BB-55) received a single torpedo in

11305-459: The effectiveness of aircraft carriers was known, the Americans favored a methodical "island-hopping" advance, never going far beyond land-based air cover. Meanwhile, a blockade was imposed from the very beginning of the war, with the first American submarine, USS  Gudgeon , arriving off Japan on about 31 December 1941. A number of requirements grew out of Orange, including the specification for

11438-448: The end of World War II . While dipping hydrophones appeared before war's end, the trials were abandoned. Seaplanes and airships were also used to patrol for submarines. A number of successful attacks were made, but the main value of air patrols was in driving the U-boat to submerge, rendering it virtually blind and immobile. However, the most effective anti-submarine measure was

11571-440: The endurance of small submarines. Previously the emphasis had been largely on deep water operation but this has now switched to littoral operation where ASW is generally more difficult. There are a large number of technologies used in modern anti-submarine warfare: In modern times forward looking infrared (FLIR) detectors have been used to track the large plumes of heat that fast nuclear-powered submarines leave while rising to

11704-517: The fact a submarine of the day was often on the surface for a range of reasons, such as charging batteries or crossing long distances. The first approach to protect warships was chainlink nets strung from the sides of battleships , as defense against torpedoes . Nets were also deployed across the mouth of a harbour or naval base to stop submarines entering or to stop torpedoes of the Whitehead type fired against ships. British warships were fitted with

11837-517: The famous "apes" of Gibraltar, which are actually monkeys . These are the only wild apes or monkeys found in Europe. This species, known scientifically as Macaca sylvanus , is listed as endangered by the IUCN Red List and is declining. Three-quarters of the world population live in the Middle Atlas mountains of Morocco . Recent genetic studies and historical documents point to their presence on

11970-750: The fleet would sail to the western Pacific to relieve American forces in Guam and the Philippines. Afterwards, the fleet would sail north for a decisive battle against the Imperial Japanese Navy 's Combined Fleet and then blockade the Japanese home islands . The strategy was in keeping with the theory of Alfred Thayer Mahan , a doctrine to which every major navy subscribed before World War II in which wars would be decided by engagements between opposing surface fleets (as they had been for over 300 years). Following

12103-623: The fortifications and the port. During the Second World War , most of Gibraltar's civilian population was evacuated , mainly to London, but also to parts of Morocco and Madeira and to Gibraltar Camp in Jamaica . The Rock was strengthened as a fortress . On 18 July 1940, the Vichy French air force attacked Gibraltar in retaliation for the British bombing of the Vichy navy. The naval base and

12236-415: The frontier workers are Spanish nationals. More than half (55 Percent) of the private sector employee jobs are held by persons who are not Gibraltarians or Other British nationalities. The public sector, on the other hand, employs mainly Gibraltarians and other British (90 Percent) As a consequence, according to Fabian Picardo , Chief Minister of Gibraltar, during Brexit negotiations, a frontier which lacked

12369-466: The garrison of the town for two years, after which time they were expelled, returning to their home towns or moving on to other parts of Spain. In 1501, Gibraltar passed back to the Spanish Crown, and Isabella I of Castile issued a Royal Warrant granting Gibraltar the coat of arms that it still uses. In 1704, during the War of the Spanish Succession , a combined Anglo - Dutch fleet, representing

12502-497: The helicopter has been used solely for sensing and rocket delivered torpedoes used as the weapon. Surface ships continue to be an important ASW platform because of their endurance, now having towed array sonars. Submarines are the main ASW platform because of their ability to change depth and their quietness, which aids detection. In early 2010 DARPA began funding the ACTUV programme to develop

12635-405: The highly defended Straits of Gibraltar , where nine were sunk, and a similar number damaged so severely they had to limp back to base. The Mediterranean is calmer than the Atlantic, which made escape for U-boats more difficult and was ringed with Allied air bases. Similar ASW methods were used as in the Atlantic but an additional menace was the use by Italians of midget submarines. Operating under

12768-637: The introduction of submarine-launched ballistic missiles , which greatly increased the lethality of submarines. At the beginning of the twentieth century, ASW techniques and submarines themselves were primitive. During the First World War , submarines deployed by Imperial Germany proved themselves to be a capable threat to shipping, being capable of striking targets even out in the North Atlantic Ocean. Accordingly, multiple nations embarked on research into devising more capable ASW methods, resulting in

12901-555: The introduction of escorted convoys , which reduced the loss of ships entering the German war zone around the British Isles from 25% to less than 1%. The historian Paul E. Fontenoy summarised the situation as: "[t]he convoy system defeated the German submarine campaign ." A major contributing factor was the interception of German submarine radio signals and breaking of their code by Room 40 of

13034-457: The introduction of practical depth charges and advances in sonar technology; the adoption of the convoy system also proved to be a decisive tactic. After a lull in progress during the interwar period, the Second World War would see submarine warfare and ASW alike advance rapidly, particularly during the critical Battle of the Atlantic , during which Axis submarines sought to prevent Britain from effectively importing supplies. Techniques such as

13167-526: The island at a critical time in the face of concentrated air attacks from German and Italian forces. Spanish dictator Francisco Franco 's reluctance to allow the German Army onto Spanish soil frustrated a German plan to capture the Rock, codenamed Operation Felix . In the 1950s, Franco renewed Spain's claim to sovereignty over Gibraltar and restricted movement between Gibraltar and Spain. Gibraltarians voted overwhelmingly to remain under British sovereignty in

13300-409: The large British high street chains have branches or franchises in Gibraltar including Morrisons , Marks & Spencer and Mothercare . Branches and franchises of international retailers such as Tommy Hilfiger and Sunglass Hut are also present in Gibraltar, as is the Spanish clothing company Mango . Anti-submarine warfare Anti-submarine warfare ( ASW , or in the older form A/S )

13433-502: The largest and longest range vessels of their type and were armed with the Type 95 torpedo . However, they ended up having little impact, especially in the latter half of the war. Instead of commerce raiding like their U-boat counterparts, they followed the Mahanian doctrine, serving in offensive roles against warships, which were fast, maneuverable and well-defended compared to merchant ships. In

13566-409: The main weapon (though nuclear depth charges were developed). The mine continued to be an important ASW weapon. In some areas of the ocean, where land forms natural barriers, long strings of sonobuoys, deployed from surface ships or dropped from aircraft, can monitor maritime passages for extended periods. Bottom mounted hydrophones can also be used, with land based processing. A system like this SOSUS

13699-401: The military and closed to the general public. Gibraltar has a Mediterranean climate ( Köppen climate classification Csa ), with mild, rainy winters and summers that are very warm to hot and humid, but with very little rainfall. As is the case for nearby Algeciras and Tarifa , summers are significantly cooler and annual temperature more constant than other cities on the southern coast of

13832-473: The navy as many as ten submarines and 800 crewmen. Much later in the war, active and passive sonobuoys were developed for aircraft use, together with MAD devices. Toward the end of the war, the Allies developed better forward-throwing weapons, such as Mousetrap and Squid , in the face of new, much better German submarines, such as the Type XVII and Type XXI . British and Dutch submarines also operated in

13965-403: The necessary fluidity for people to be able to access their places of work would put directly at risk nearly half of the jobs of the Gibraltar workforce. In the early 2000s, many bookmakers and online gaming operators moved to Gibraltar to benefit from operating in a regulated jurisdiction with a favourable corporate tax regime. This corporate tax regime for non-resident controlled companies

14098-719: The need for an anti-submarine warfare strategy. While the Allies took extensive measures to combat the threat of German U-boats , the Japanese failed to effectively counter the American submarines which ultimately choked Japan's industrial production and paralyzed her navy . Japan also notably failed to institute an anti-commerce campaign where systematic use of commerce raiders could have made Allied operations much more complex and conquering and holding Japanese-held islands more difficult. American war planners failed to appreciate that technological advances in submarines and naval aviation had made Mahan's doctrine obsolete and did not anticipate

14231-472: The ocean's surface, to reach submarines wherever they might be. The military submarine is still a threat, so ASW remains a key to obtaining sea control. Neutralizing the SSBN has been a key driver and this still remains. However, non-nuclear-powered submarines have become increasingly important. Though the diesel-electric submarine continues to dominate in numbers, several alternative technologies now exist to enhance

14364-459: The organizations needed (unlike the Allies in the Atlantic). Japanese antisubmarine forces consisted mainly of their destroyers, with sonar and depth charges. However, Japanese destroyer design, tactics, training, and doctrine emphasized surface nightfighting and torpedo delivery (necessary for fleet operations) over anti-submarine duties. By the time Japan finally developed a destroyer escort , which

14497-526: The private sector and 20% in the public sector. The unemployment rate is extremely low, at around 1 per cent. More than half (53 Percent) of the labour force are resident in Spain or are non Gibraltarians. According to the Government of Gibraltar's statistics, around 45 Percent of the total employee jobs, and 58% of the private sector jobs, are held by frontier workers (employees who are normally resident in Spain but are employed in Gibraltar). Around 63 Percent of

14630-475: The private sector. Since Brexit , Gibraltar is not a member of the European Union but negotiations are under way to have it participate in the Schengen Agreement to facilitate border movements between Gibraltar and Spain. As of March 2023 , talks seem deadlocked. The name is derived from Arabic : جبل طارق , romanized :  Jabal Ṭāriq , lit.   'Mount of Tariq' (named after

14763-632: The same attack with the USS Wasp, causing it to miss critical naval actions of the Guadalcanal campaign. Once the US was able to ramp up construction of destroyers and destroyer escorts , as well as bringing over highly effective anti-submarine techniques learned from the British from experiences in the Battle of the Atlantic , they would take a significant toll on Japanese submarines, which tended to be slower and could not dive as deep as their German counterparts. Japanese submarines, in particular, never menaced

14896-428: The same clear-water conditions in the Mediterranean – such that British submarines were painted dark blue on their upper surfaces to make them less visible from the air when submerged at periscope depth – the Royal Navy, mostly operating from Malta , lost 41 submarines to the opposing German and Italian forces, including HMS Upholder and HMS Perseus . Japanese submarines pioneered many innovations, being some of

15029-438: The sea via the neutralization of the US battle line force. The game carried two implications, both of them fatal to the "thrusting" concept. First, it showed that underwater damage would likely trump whatever the fleet could do in the western Pacific at the outset of a war. Ships would almost inevitably be torpedoed, and they would have to go somewhere other than the Philippines for repairs. If enough of them had to be repaired at

15162-514: The seabed to detect the magnetic field of submarines as they passed overhead. At this stage, they were used in conjunction with controlled mines which could be detonated from a shore station once a 'swing' had been detected on the indicator loop galvanometer . Indicator loops used with controlled mining were known as 'guard loops'. By July 1917, depth charges had developed to the extent that settings of between 50–200 ft (15–61 m) were possible. This design would remain mainly unchanged through

15295-501: The settlements of Sandy Bay and Catalan Bay ; and the Westside , where the vast majority of the population lives. Gibraltar has no administrative divisions but is divided into seven Major Residential Areas . Having negligible natural resources and few natural freshwater resources, limited to natural wells in the north, until recently Gibraltar used large concrete or natural rock water catchments to collect rainwater. Fresh water from

15428-589: The ships actually monitoring the enemy submarine. Submerged submarines are generally blind to the actions of a patrolling aircraft until it uses active sonar or fires a weapon, and the aircraft's speed allows it to maintain a fast search pattern around the suspected contact. Increasingly anti-submarine submarines, called attack submarines or hunter-killers, became capable of destroying, particularly, ballistic missile submarines. Initially these were very quiet diesel-electric propelled vessels but they are more likely to be nuclear-powered these days. The development of these

15561-463: The ships based there played a key role in the provisioning and supply of the island of Malta during its long siege . As well as frequent short runs, known as "Club Runs", towards Malta to fly off aircraft reinforcements (initially Hurricanes , but later, notably from the USN aircraft carrier Wasp , Spitfires ), the critical Operation Pedestal convoy was run from Gibraltar in August 1942. This resupplied

15694-626: The site of an early settlement of the native Turdetani people. After the collapse of the Western Roman Empire , Gibraltar came briefly under the control of the Vandals , who crossed into Africa at the invitation of Boniface , the Count (or commander) of the territory. The area later formed part of the Visigothic Kingdom of Hispania for almost 300 years, from 414 until 711 AD. Following

15827-605: The situation. Other mammals found in Gibraltar include rabbits, foxes and bats. Dolphins and whales are frequently seen in the Bay of Gibraltar . Migrating birds are very common and Gibraltar is home to the only Barbary partridges found on the European continent. In 1991, Graham Watson, Gibraltar's MEP , highlighted conservationists ' fears that urban development , tourism and invasive plant species were threatening Gibraltar's own plants as well as birds and bat species . In May 2016,

15960-408: The successive generations of Allied airborne radar. The first generation of Allied airborne radar used a 1.7 meter wavelength and had a limited range. By the second half of 1942 the " Metox " radar detector was used by U-boats to give some warning from airborne attack. During 1943, the Allies began to deploy aircraft equipped with new cavity magnetron-based 10-centimeter wavelength radar (ASV III), which

16093-494: The surface, as U-boats routinely did at night. The Royal Navy had continued to develop indicator loops between the wars but this was a passive form of harbour defense that depended on detecting the magnetic field of submarines by the use of long lengths of cable lain on the floor of the harbour. Indicator loop technology was quickly developed further and deployed by the US Navy in 1942. By then, there were dozens of loop stations around

16226-609: The surface. FLIR devices are also used to see periscopes or snorkels at night whenever a submariner might be incautious enough to probe the surface. Satellites have been used to image the sea surface using optical and radar techniques. Fixed-wing aircraft, such as the P-3 Orion & Tu-142 provide both a sensor and weapons platform similar to some helicopters like the Sikorsky SH-60 Seahawk , with sonobuoys and/or dipping sonars as well as aerial torpedoes . In other cases

16359-491: The term "Asdic", but relations with the BIR were poor. After 1917, most ASW work was carried out by the ASD. In the U.S., a Naval Consulting Board was set up in 1915 to evaluate ideas. After American entry into the war in 1917, they encouraged work on submarine detection. The U.S. National Research Council , a civilian organization, brought in British and French experts on underwater sound to

16492-668: The troublesome Hooven-Owens-Rentschler , which proved useful for railroads. Gibraltar Gibraltar ( / dʒ ɪ ˈ b r ɔː l t ər / jib- RAWL -tər , Spanish: [xiβɾalˈtaɾ] ) is a British Overseas Territory and city located at the southern tip of the Iberian Peninsula , on the Bay of Gibraltar , near the exit of the Mediterranean Sea into the Atlantic Ocean ( Strait of Gibraltar ). It has an area of 6.8 km (2.6 sq mi) and

16625-513: The world. Sonar was far more effective and loop technology for ASW purposes was discontinued shortly after the conflict's end. The use and improvement of radar technology was one of the most important elements in the fight against submarines. Locating submarines was the first step in being able to defend against and destroy them. Throughout the war, Allied radar technology was much better than their German counterparts. German U-boats struggled to have proper radar detection capabilities and keep up with

16758-518: Was also a potential hazard to the dropping ship. During the First World War , submarines were a major threat. They operated in the Baltic, North Sea, Black Sea and Mediterranean as well as the North Atlantic. Previously, they had been limited to relatively calm and protected waters. The vessels used to combat them were a range of small, fast surface ships using guns and good luck. They mainly relied on

16891-518: Was also the basis of the United States' insistence on 60%, which amounted to parity. Actual events generally followed the plan. Although carrier battles and the use of airplanes and submarines overshadowed surface action, the "leapfrog" campaign played out largely as anticipated. The Imperial Japanese Navy, obsessed with the "decisive battle" doctrine, ignored the vital need for defense against submarines . The German and American submarine campaigns against their opponents' merchant shipping demonstrated

17024-526: Was deployed by the US in the GIUK gap and other strategically important places. Airborne ASW forces developed better bombs and depth charges , while for ships and submarines a range of towed sonar devices were developed to overcome the problem of ship-mounting. Helicopters can fly courses offset from the ships and transmit sonar information to their combat information centres . They can also drop sonobuoys and launch homing torpedoes to positions many miles away from

17157-674: Was invented in 1937, which became a common fixture amongst ASW ships within only a few years. There were relatively few major advances in weapons during the period; however, the performance of torpedoes continued to improve. During the Second World War , the submarine menace revived, threatening the survival of island nations like Britain and Japan which were particularly vulnerable because of their dependence on imports of food, oil, and other vital war materials. Despite this vulnerability, little had been done to prepare sufficient anti-submarine forces or develop suitable new weapons. Other navies were similarly unprepared, even though every major navy had

17290-508: Was more economical and better suited to convoy protection, it was too late; coupled to incompetent doctrine and organization, it could have had little effect in any case. Late in the war, the Japanese Army and Navy used Magnetic Anomaly Detector (MAD) gear in aircraft to locate shallow submerged submarines. The Japanese Army also developed two small aircraft carriers and Ka-1 autogyro aircraft for use in an antisubmarine warfare role, while

17423-500: Was phased out by January 2011 and replaced by a still favourable fixed corporate tax rate of 10 per cent. Tourism is also a significant industry. Gibraltar is a popular port for cruise ships and attracts day visitors from resorts in Spain. The Rock is a popular tourist attraction, particularly among British tourists and residents in the southern coast of Spain. It is also a popular shopping destination, and all goods and services are VAT free, but may be subject to Gibraltar taxes. Many of

17556-523: Was strongly influenced by the duel between HMS  Venturer and U-864 . A significant detection aid that has continued in service is the Magnetic Anomaly Detector (MAD), a passive device. First used during the Second World War, MAD uses the Earth's magnetosphere as a standard, detecting anomalies caused by large metallic vessels, such as submarines. Modern MAD arrays are usually contained in

17689-600: Was undetectable by "Metox", in sufficient numbers to yield good results. Eventually the "Naxos" radar detector was fielded that could detect 10-cm wavelength radar, but it had a very short range and only gave a U-boat limited time to dive. Between 1943 and 1945, radar equipped aircraft would account for the bulk of Allied kills against U-boats. Allied anti-submarine tactics developed to defend convoys (the Royal Navy 's preferred method), aggressively hunt down U-boats (the U.S. Navy approach), and to divert vulnerable or valuable ships away from known U-boat concentrations. During

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