Sheck Exley is dead and died in a cave at age 45. If you read the preface of these cave diving books you'll notice most are mentioned in past tense.
David Shaw died trying to recover the body of Deon Dreyer
Paul Heinerth is still alive and you can read here about his recovering dead divers from caves for the family. http://www.sptimes.com/2004/06/16/Hernando/Lost_diver_found_in_i.shtml
Recreational Diving is a fun and safe sport, one of the biggest things I like about it is if any or all things go wrong I just say to myself 'Rats! I have to come up now' and not 'Aw [#%!] I'm dead!'






White Sands Dive Shop
https://whitesandsdiveshop.com/