In the early 1960s a group of Chief Petty Officers from the Naval Air Command decided to form amateur diving clubs and mounted annual expeditions . These clubs were first based at the naval air stations of Portland ( HMS Osprey ) , Culdrose and Yeovilton and conducted diving under the auspices of an umbrella organisation which became known as the " Naval Air Command Sub Aqua Club " ( NACSAC ) . The club 's first chairman was Lieutenant Roy Graham ( 1924 – 2007 ) , an engineer officer who had begun his diving career aboard the aircraft carrier '' HMS Victorious '' . Whilst in Gibraltar , he was in charge of diving training on this ship . Following a shallow water diving course with 24 entrants and only himself and a Royal Air Force medical officer finishing the rigorous training , Graham became the only Fleet Air Arm officer with a naval diving qualification . The organisations Diving Officer from its formation in 1960 was Chief Petty Office Richard Larn , who apart from a period on HMS Bulwark in 1967-8 continued to organise training and expeditions until his retirement from the navy in 1971 . One of the club 's first projects was to send a team of divers to the Isles of Scilly to find an historic Royal Navy ship , HMS Association , a 90-gun ship of the line lost in the great naval disaster in 1707 . In 1964 about ten NACSAC members - including the shipwreck expert and writer , Chief Petty Officer Richard Larn - arrived on Scilly , believed to be only the second group of divers to visit the area . Their initial dives began a series of navy visits that continued for four years . In 1964 , 1965 and 1966 the divers could only access the Western Rocks , but barely around the Gilstone Ledge , where a later expedition managed to locate the wreck of '' HMS Association '' in 1967 . The rediscovery of the site also led to more government legislation , notably the Protection of Wrecks Act 1973 , passed in an attempt to preserve British historic wreck sites as part of the maritime heritage
great naval disaster in 1707
Scilly naval disaster of 1707
Naval Air Command Sub Aqua Club