Diving helmet
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A diving helmet is a rigid head enclosure with a breathing gas supply used in underwater diving. They are worn mainly by professional divers engaged in surface-supplied diving, though some models can
Copper and brass three bolt Soviet diving helmet.
US Navy Diver using Kirby Morgan 37 diving helmet
1842 sketch of the Deane brothers' diving helmet, the first surface-supplied diving dress equipment in the world.
Display of diving helmets from several countries
Hazmat diving
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Hazmat diving is underwater diving in a known hazardous materials environment. The environment may be contaminated by hazardous materials, the diving medium may be inherently a hazardous material, or
Diving helmet
…the suit or helmet is compromised. They also remain relatively common in shallow-water air diving, where gas consumption is of little concern, and in nuclear diving because they must be disposed of after some period of use due to irradiation; free-flow helmets are significantly less expensive to purchase and maintain…
US Navy Diver being decontaminated after a dive. If the contamination was severe, the decontamination team would have been wearing hazmat gear.