Martyn is world renowned as a caver and cave diver. He is responsible for the discovery of miles of cave passage in many countries and is internationally acclaimed for his prolific writing and stunning photography. Caving from the age of ten and discovering new caves by the age of 16, Martyn remains as passionate as ever. Martyn began cave diving in 1971 and by 1981 had established a world record for underwater cave penetration in the Bahamas. In the UK he is particularly renowned for his exploration in Wookey Hole - 1977 and 1982 - and the first traverse of Llangattock Mountain in Wales in 1986. Many expeditions have been made worldwide, to such places as Iran, Mexico, Borneo, China, Dominican Republic, Japan, Spain, the Canary Islands, the Ballearics, Greece, Turkey, Brazil, Australia, Russia and most recently New Zealand. Age has not diminished his enthusiasm or powers of endurance. In November 2012 he explored over one mile of new cave in South Island, New Zealand and in December 2013 he discovered another mile of virgin cave beyond sumps in the same area. These outstanding discoveries were solo undertakings which amazingly he managed to video. Martyn is internationally recognised as a cave and cave diving photographer and has taken any number of celebrities underground including HRH's Princes William and Harry.