Scientists descend deep below the Atlantic in a diving bell or bathysphere.
Australians show of a new design of deep sea diving suit in Sydney Harbour - it seems to work.
Experiments in deep sea diving at Royal Naval Physiological Laboratory.
Frogmen at the Royal Naval Physiological Laboratory are tested in a deep dive simulator.
Men are helped into antiquated diving suits.
Deep Sea diving off the coast of Boston in the United States of America.
A diver goes underwater to inspect the supports of Southend Pier.