Standard diving dress - Wikipedia
https://en.m.wikipedia.org/wiki/Standard_diving_dress
WebStandard diving dress, also known as hard-hat or copper hat equipment, deep sea diving suit or heavy gear, is a type of diving suit that was formerly used for all relatively deep underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work ... bell suit
bell suit
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