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Navy Dive Officer Lt.j.g. Charles Spenser has his hard-hat dive helmet checked before a dive from USS Grapple (ARS 53). - PICRYL - Public Domain Media Search Engine Public Domain Search
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Hard Hat Diving & Pearl Harvest Show (free with your AQWA entry) - AQWA - The Aquarium of Western Australia Reservations
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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