I overheard one commercial diver saying to another:
"Yeah the sea is only salt for the first ten meters so once you get below that its fresh so you can take you reg out and have a drink if you get thirsty"
And later that day:
Diver 1 - "hey I tried to drink at 12 meters and it tasted salty you *****"
Diver 2 - "Yeah it was a bit rough yesterday the salt and fresh water must have gotten mixed up a bit next time go a bit deeper before you try to take a drink in case the sea gets churned up again"
Diver 1 - "Ah ok that must be it thanks"
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UM ER YASEE --there are places where thats actually true
yea I know-spoil the joke --sorry