In the past deep sea divers had suits with heavy helmets and an air hose attached. There are stories of the air failing. Because of the extreme pressure, they have found nothing
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In the past deep sea divers had suits with heavy helmets and an air hose attached. There are stories of the air failing. Because of the extreme pressure, they have found nothing
Were there actual cases of old-time divers being crushed into their helmets by water pressure? - Quora
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In what applications would a diver use a diving helmet? - Quora