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Deep-sea diving act of descending into deep water, with some breathing apparatus, help them to remain there for an extended period. There can be multiple gases used depending on desired depth and length of dive the common is a tri-mixed gas of Nitrogen, Oxygen, and Helium.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoNormal divers would use compressed air, however for deep sea diving a large proportion of the Nitrogen in compressed air is replaced with Helium, this is done to prevent nitrogen bubbles forming in the blood as the diver decompresses, this causes the bends and can be fatal, so the answer to your question is Helium.
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