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I can't help but think of deep sea divers using helium as part of their mix, and talking in chipmunk high-pitched voices.

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Here's a phone call between US President Lyndon B. Johnson and Sealab 2 who were doing just that:

https://www.youtube.com/watch?v=wusrtGfjzZg

Here’s a diver checking out an air pocket in a sunken boat finding someone alive in an air pocket (most of the recording is the guy at sea level, but you really get the chipmunk from the diver):

https://youtu.be/LrvRwNaE7Eo?si=bmFzXBmiC1QUwnIF

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