Plymouth Sound, or locally just The Sound, is a deep Inlet or sound in the English Channel near Plymouth in England.
Scapa Flow is a body of water in the Orkney Islands, Scotland, sheltered by the islands of Mainland, Graemsay, Burray, South Ronaldsay and Hoy. Its sheltered waters have played an important role in travel, trade and conflict throughout the centuries. Vikings anchored their longships in Scapa Flow more than a thousand years ago. It was the United Kingdom's chief naval base during the First and Second World Wars, but the facility was closed in 1956.
HMS Scylla (F71) was a Leander-class frigate of the Royal Navy (RN). She was built at Devonport Royal Dockyard, the last RN frigate to be built there as of 2016. Scylla was commissioned in 1970, taken out of service in 1993 in accordance with Options for Change, and sunk as an artificial reef in 2004 off Whitsand Bay, Cornwall.
HMAS Swan, named for the Swan River, was a River-class destroyer escort of the Royal Australian Navy (RAN). Constructed in Melbourne following the loss of HMAS Voyager, Swan entered service in 1970.
HMT Warwick Deeping (H136) was a naval trawler of the British Royal Naval Patrol Service during World War II, sunk off the Isle of Wight in October 1940.
HMS Edinburgh was a Town-class light cruiser of the Royal Navy, which served during the Second World War. She was one of the last two Town class cruisers, which formed the Edinburgh sub-class. Edinburgh saw a great deal of combat service during the Second World War, especially in the North Sea and the Arctic Sea, where she was sunk by torpedoes in 1942.
HMS Swordfish (61S) was a first-batch S-class submarine built for the Royal Navy during the 1930s. Commissioned in 1932, she was given the pennant number 61S and was assigned to the 2nd Submarine Flotilla.
HMS Pelorus was an Algerine-class minesweeper built for the Royal Navy (RN) during World War II. Upon completion, the ship became the flotilla leader of the 7th Minesweeper Flotilla, clearing mines off the east coast of England. In June 1944, the flotilla was assigned to sweep one of the beaches during the Normandy landings until she struck a mine the following month. After her repairs were completed, Pelorus was reassigned to the English Channel and the 6th Minesweeping Flotilla. The flotilla was transferred to the Indian Ocean in 1945 and spent some time escorting convoys. They participated in Operation Collie, a bombardment of Japanese positions in the Nicobar Islands, in July and then swept the Strait of Malacca and the approaches to Singapore in August.
The UB II type submarine was a class of U-boat built during World War I by the German Imperial Navy. They were enlarged from the preceding type UB I and were more effective vessels. The boats were a single hull design with a 50-metre maximum diving depth and a 30-45 second diving time. In 1915 and 1916, 30 were built at two different shipyards.
HMS Thames was a Mersey-class protected cruiser built for the Royal Navy (RN) in the 1880s. The ship was placed in reserve upon her completion in 1888 and was converted into a submarine depot ship in 1903. She was sold out of the navy in 1920 and was purchased by a South African businessman to serve as a training ship for naval cadets under the name SATS General Botha. The ship arrived in South Africa in 1921 and began training her first class of cadets in Simon's Town the following year. General Botha continued to train cadets for the first several years of World War II, but the RN took over the ship in 1942 for use as an accommodation ship under her original name. She was scuttled by gunfire in 1947 and is now a diveable wreck.
HMNZS Canterbury (F421) was one of two broad beam Leander-class frigates operated by the Royal New Zealand Navy (RNZN) from 1971 to 2005. She was built in Scotland and launched in 1970. Commissioned in 1971, Canterbury saw operational service in much of Australasia and other regions like the Persian Gulf. She undertook operations such as supporting UN sanctions against Iraq and peace-keeping in East Timor. With her sister ship HMNZS Waikato she relieved the Royal Navy frigate HMS Amazon in the Indian Ocean during the Falklands War. Early in HMNZS Canterbury's career, in 1973, she relieved the frigate HMNZS Otago, as part of a unique, Anzac, naval operation or exercise at Moruroa during anti-nuclear protests, supported by a large RAN tanker, providing fuel and a large platform for Australian media. This was due to F 421 being a more modern RNZN frigate, with then current Rn surveillance radar and ESM and a more effectively insulated frigate from nuclear fallout, with the Improved Broad Beam Leander steam plant, for example, being remote controlled and capable of unmanned operation and therefore the ship provided a more effective sealed citadel for operations in areas of nuclear explosions.
USS Mizpah (PY-29) was a United States Navy patrol yacht. Constructed in 1926, the vessel was constructed as the pleasure yacht Savarona. In 1929 it was renamed Allegro and then Mizpah for use on the Great Lakes. The vessel was acquired by the United States Navy in 1942 and converted to a warship and commissioned the same year. Mizpah served as a convoy escort along the United States East Coast before becoming a school ship in 1944. Following the end of the war, the vessel returned to private operation in 1946 until 1967 when Mizpah was laid up with a broken crankshaft at Tampa, Florida. An attempt to save the ship proved futile and Mizpah was scuttled off the coast of Florida as an artificial reef in 1968. The wreck is now a popular dive site.
Sinking ships for wreck diving sites is the practice of scuttling old ships to produce artificial reefs suitable for wreck diving, to benefit from commercial revenues from recreational diving of the shipwreck, or to produce a diver training site.
Persier was a 5,382 GRT cargo ship which was built in 1918 as War Buffalo for the British Shipping Controller. In 1919, she was sold to Belgium and renamed Persier. Between 1934 and 1941 she also held a passenger certificate. She was driven ashore on the Icelandic coast in a storm in February 1941 which put her out of action for two years. Returned to service in February 1943, she served until 11 February 1945, when she was torpedoed and sunk by U-1017 with the loss of 20 crew.
HMS Vivid was an iron screw yacht purchased from civilian service in 1891, where she had been named SS Capercailzie. She became the Devonport base ship and flagship in 1893 and was also used as the yacht for the Commander-in-Chief, Plymouth and was sold in 1912, later being wrecked in 1913.
The history of scuba diving is closely linked with the history of scuba equipment. By the turn of the twentieth century, two basic architectures for underwater breathing apparatus had been pioneered; open-circuit surface supplied equipment where the diver's exhaled gas is vented directly into the water, and closed-circuit breathing apparatus where the diver's carbon dioxide is filtered from the exhaled breathing gas, which is then recirculated, and more gas added to replenish the oxygen content. Closed circuit equipment was more easily adapted to scuba in the absence of reliable, portable, and economical high pressure gas storage vessels. By the mid-twentieth century, high pressure cylinders were available and two systems for scuba had emerged: open-circuit scuba where the diver's exhaled breath is vented directly into the water, and closed-circuit scuba where the carbon dioxide is removed from the diver's exhaled breath which has oxygen added and is recirculated. Oxygen rebreathers are severely depth limited due to oxygen toxicity risk, which increases with depth, and the available systems for mixed gas rebreathers were fairly bulky and designed for use with diving helmets. The first commercially practical scuba rebreather was designed and built by the diving engineer Henry Fleuss in 1878, while working for Siebe Gorman in London. His self contained breathing apparatus consisted of a rubber mask connected to a breathing bag, with an estimated 50–60% oxygen supplied from a copper tank and carbon dioxide scrubbed by passing it through a bundle of rope yarn soaked in a solution of caustic potash. During the 1930s and all through World War II, the British, Italians and Germans developed and extensively used oxygen rebreathers to equip the first frogmen. In the U.S. Major Christian J. Lambertsen invented a free-swimming oxygen rebreather. In 1952 he patented a modification of his apparatus, this time named SCUBA, an acronym for "self-contained underwater breathing apparatus," which became the generic English word for autonomous breathing equipment for diving, and later for the activity using the equipment. After World War II, military frogmen continued to use rebreathers since they do not make bubbles which would give away the presence of the divers. The high percentage of oxygen used by these early rebreather systems limited the depth at which they could be used due to the risk of convulsions caused by acute oxygen toxicity.
The following index is provided as an overview of and topical guide to Wikipedia's articles on recreational dive sites. The level of coverage may vary:
Recreational dive sites are specific places that recreational scuba divers go to enjoy the underwater environment or for training purposes. They include technical diving sites beyond the range generally accepted for recreational diving. In this context all diving done for recreational purposes is included. Professional diving tends to be done where the job is, and with the exception of diver training and leading groups of recreational divers, does not generally occur at specific sites chosen for their easy access, pleasant conditions or interesting features.
Kizugawa Maru, or Kitsugawa Maru, is a World War II-era Japanese water tanker sunk in Apra Harbor, Guam. Damaged by a submarine torpedo attack off Guam on April 8, 1944, she was towed into port for repairs. In port, she was further damaged in three separate U.S. air attacks during the Mariana and Palau Islands campaign. Deemed irreparable, Kizugawa Maru was scuttled by shore guns on June 27, 1944. The shipwreck is now a deep recreational diving site.
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