Bike air pump would fill with foul air modern scuba cert instructors and health experts would warn not to use this.
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Exactly. Bad air, no training about breath-hold or equalization, dangerous!
End of conversation
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Lawsuits be rollin' in when people think they can go down to 50 feet and then run out of air.

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Without weights nor BCD? No way...
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...and more dangerous. This is stupid.
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So you basically can only dive in 20 feet of water because divers need decompression stops in order to not burst. Cool concept though.
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