Swim to the Underwater Room (aka the Bubble Room)

Man makes small underwater room at the bottom of a lake
chicchoreasays...

Yes, dangerous. I wonder how long that many oxygen starved people can breathe that atmosphere and still have enough to get back topside.

As to the atmosspheric composition, not oxygen tanks, air tanks, or compressor so that the oxygen levels are only atmospheric.

Dangerous, but cool.

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