The British H-class submarines were Holland 602 type submarines used by the Royal Navy. The submarines constructed for the British Royal Navy between 1915 and 1919 were designed and built in response to German boats which mined British waters and sank coastal shipping with ease owing to their small size. The H class was created to perform similar operations in German waters, and to attack German submarines operating in British waters.
Despite their cramped size and lack of a deck gun on some submarines, the class was popular amongst submariners, and saw action all around the British Isles, some being transferred as far as the Adriatic. Owing to the late arrival of most of the class, they were unable to have much impact in service, only destroying two German submarines U-51 and UB-52 for the loss of four of their own number.
Post-war, many were retained in the Royal Navy for training purposes, while four more were lost in accidents during the 1920s. At the outbreak of the Second World War, the class was obsolete, but retained in training and coastal warfare roles to help the Royal Navy cope with heavy losses to the submarine fleet during the early stages of the war. Two were sunk in this role by German countermeasures. The Canada-built boats were equipped with Fessenden transducers, which were missing from the US-built boats.
Boats
Group 1
Group 1 was built in Canada at the Canadian Vickers Yards in Montreal before being transported across the Atlantic and deployed from Britain as British shipyards were too busy to construct submarines at this time:
The second group was constructed simultaneously with the first group, but at Fore River Yard at Quincy, Massachusetts in the then-neutral United States. When the U.S. government discovered the construction, they impounded all the completed units, releasing them only following their own declaration of war two years later. To escape this difficulty, the British government gave six units to the Chilean Navy as partial payment for the appropriation of six Chilean ships for British service in 1914:
Group 3 was the largest group, and was constructed in 1917–1919 in Britain, shipyard space having been granted to the project and more boats needed following the seizure of those building in the United States. They were built by Vickers, Cammell Laird, Armstrong Whitworth and William Beardmore at several locations, and most of the boats enjoyed long careers in the Royal Navy:
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The Holland 602 type submarine, also known as the H-class submarine, was one of the most numerous submarines of World War I. The type was designed by the Electric Boat Co. of the United States, but most of the boats were built abroad: in Canada by the subsidiary of the British Vickers company and in British shipyards.
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The Parker-class leaders or improved Marksman-class leaders were a class of six destroyer leaders built for the Royal Navy during 1916–17 for World War I service. They were named after famed historical naval leaders, except for Anzac, which was named to honour the Australian and New Zealand Army Corps, and was later transferred to the Royal Australian Navy. They were the last major Royal Navy warships to be ordered with three propeller shafts, a design that was never widely adopted in British warships.
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 Stubborn was an S-class submarine of the Royal Navy, and part of the Third Group built of that class. She was built by Cammell Laird and launched on 11 November 1942. So far she has been the only ship of the Royal Navy to bear the name Stubborn.
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HMS Douglas was an Admiralty type flotilla leader of the British Royal Navy. Built by Cammell Laird, Douglas commissioned in 1918, just before the end of the First World War. During the Second World War, Douglas served with Force H out of Gibraltar and as a convoy escort. She was sold for scrap in March 1945.
HMS Medusa was a Medea-class destroyer of the British Royal Navy. She was one of four destroyers, of similar design to the British M-class ordered by Greece in June 1914, which the British purchased during construction owing to the outbreak of the First World War.
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.
HMS Seymour was a Parker-class flotilla leader of the British Royal Navy. She was built by Cammell Laird during the First World War, being launched on 31 August 1916 and completing on 30 November that year. Seymour served with the Grand Fleet for the rest of the war, which she survived. The ship was sold for scrap in January 1931.
HMS Melpomene was a Medea-class destroyer of the British Royal Navy. She was one of four destroyers, of similar design to the British M-class ordered by Greece in June 1914, which the British purchased during construction owing to the outbreak of the First World War.
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