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To: "techdiver" <techdiver@opal.com>
Subject: Sheck's book, etc.
From: "HeimannJ" <heimannj@ma*.nd*.gt*.co*>
Date: 4 Apr 1995 18:11:33 -0500

I just got a copy of Sheck Exley's autobiography, _Caverns Measureless to Man_
this week, and am about halfway through.  This is an excellent book.  It sheds
some new, personal light on Sheck's many record-setting dives, and on the
history of cave diving in general.  It's available through the NSS.

This book raises a question for me which historians or old-timers on the list
may be able to answer.   Although there were divers going beyond 300 fsw on
air in the 60's and 70's, I can't figure out how they planned their dives.  As
far as I can tell they didn't have access to anything other than Navy tables. 
Did they extrapolate stop times from these beyond 300 fsw?

John

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