Original illustration of the Mark V Diving Helmet, in continuous Navy service from 1916 to the mid-1980s — nearly 70 years. A fully rigged Mark V weighs about 55 pounds; rare "gas hat" versions were later adapted to mix helium and oxygen, letting divers go far deeper than a standard air hat allowed.
Premium cotton for a classic, regular fit.
Original illustration of the Mark V Diving Helmet, in continuous Navy service from 1916 to the mid-1980s — nearly 70 years. A fully rigged Mark V weighs about 55 pounds; rare "gas hat" versions were later adapted to mix helium and oxygen, letting divers go far deeper than a standard air hat allowed.
Premium cotton for a classic, regular fit.
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