Lee said:

>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<

Ohh, thanx. 

But the sentence  also would make sense without the 'h', dunnit?

M