Comment by LeifCarrotson

Recreational (not caves, no thank you!) diver here, jealous of your balmy 21C=70F water temps.

Here in lakes Michigan and Superior, diving on wrecks usually brings you below the thermocline to water temps from 0C to 10C ~= 50F. Only on rare inversions or at the surface at the south end of the lakes do water temps get much above 70.

You Florida, Carribean, and Central American divers have it made with your balmy water temperatures!