Long before we had spacesuits, we had diving suits. The ocean was the first hostile environment that we sent people into, completely covered with protective gear. And the suits that people created with lateth century or 19th century technology are astonighing to behold. See for yourself!
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Standard diving dress also known as hard-hat or copper hat equipment, or heavy gear is a type of diving suit that was formerly used for all underwater work that required more than breath-hold duration, which included marine salvage , civil engineering , pearl shell diving and other commercial diving work, and similar naval diving applications. Standard diving dress has largely been superseded by lighter and more comfortable equipment. Standard diving dress consists of a diving helmet made from copper and brass or bronze , an air hose from a surface-supplied manually operated pump or low pressure breathing air compressor, a waterproofed canvas suit, a diving knife , and weights to counteract buoyancy , generally on the chest, back and shoes. Some variants used rebreather systems to extend the use of gas supplies carried by the diver, and were effectively self-contained underwater breathing apparatus, and others were suitable for use with helium based breathing gases for deeper work.