I just read the book, which an dive buddy recommended to me. He has bought it for several people, and feels that every diver should read it. I have a background in diver rescue, pararescue, have done some limited cave diving in the 1970's, and very little deep diving. I am also a Certified Safety Professional, and employed in the occupational safety and health field. So this book is of special interest to me.
Several things struck me about the divers in the book:
--They would risk deep, highly technical dives simply to get artifacts for bragging rights.
--They wanted to be macho divers, and almost worshiped Sheck Exley (who himself later died trying to set a deep-diving record).
--That the lure of deep diving, pushing the limits, continues from the beginning of our sport.
--That these divers are not much interested in the marine environment as much as what they can bring up to show off to others. It seems something is lacking there.
--The safety measures were, and most likely continue to be, lacking for these technical divers. They are taught to be "self-contained," but dive with doubles and two additional tank, take two off and leave them outside a wreck, cannot find them on their way out after an almost fatal entrapment situation, and decide that they can surface. They spent 40 minutes at 230 feet. My decompression table states their decompression as 156:50 for total decompression from this dive (USN, 1970) with almost 3 minutes ascent to the first stop, with decomplession starting at 60 feet. My more recent tables don't list this dive profile. Decompression meters, while great tools (I may even buy one soon) don't overturn dive physiology realities. Dives in expeditions diving profiles like this have large bottles with regulators at decompression stages available (at least, the one I dove did, the Warm Mineral Springs Underwater Archaeological Project in Florida, 1973).
--When they got into trouble, there was no way to get them on-board but for them to climb the ladder. There was no dive platform, and street-clothed crew members had to jump into cold water to assist them. Chrissy was dragged with most of his gear on up, while the crew in the water was successful in cutting his Dad out of his dive gear. They did not ditch, or go through other emergency procedures, in the water (physically, they probably couldn't). There was no rescue diver posted, as is common in expeditions, and no emergency plan made. There was no on-board chamber available for such a hazardous diving profile. Everything depended upon their diving skills and no emergency happening.
--Worse than all this, neither one really wanted to dive that day. They groaded themselves into a very dangerous situation, with seas 6-8' and marginal conditions that were deteriorating.
I could go on, but that's as much as I want to post currently.
SeaRat