Mike said:

>> The fact that there is ice on top is irrelevant. The only thing that
>> counts is the duration of the dives. Which is obviously true for any
>> water temperature.

>Definitely don't agree that the ice top is irrelevant!<

It sure is, in the context of 'extreme' diving when temperature is the
issue. If you have to bang your head against it while trying to surface, I
would have to agree with you, tough.

Here's a few "h"s just in case you're runnin' low.  Certified to be free of
French influence.

hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

Lee