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The Sea-Dweller, created to accompany the pioneers of deep-sea diving.

Presented in 1967, it is notably equipped with the helium escape valve, an innovation that has played a key role in underwater research since it first accompanied a new professional diving technique: saturation diving. Initially capable of descending to 610 metres (2,000 feet), since 1978 the Oyster Perpetual Sea-Dweller has been guaranteed waterproof to a depth of 1,220 metres (4,000 feet).