John Bevan first learnt to dive in 1960 and it has been his life ever since. He excelled as a sport diver gaining the highest qualifications, captained the best under water hockey (Octopush) team in the country, helped find the wreck of Henry VIII's Mary Rose, then as a scientific diver working for the Ministry of Defence he achieved the world depth record of 1535 ft (465m) in 1970, breaking through the "helium barrier". As a professional diver he became the technical manager of a leading North Sea diving company, a diving consultant to the offshore oil industry including BP, Shell and British Gas, followed by many years as the UK's leading expert witness in diving accident investigations. Today he is the author of a series of unique, authoritative books on diving, ranging from historical to technological. In his spare time (?) he is the chairman of the Historical Diving Society and Collection Manager of the UK's premier, all-volunteer Diving Museum. He is married with two grown-up children and lives in Alverstoke, Hampshire.