What is also amazing to me is that after 72 hours at 100 feet, he only needed two hours of deco (although it does say that he spent time in a chamber afterwards).
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So, go with 12 lpm. 40,000 liters would allow him to do it open circuit. Thats a pretty big space, about 2m X 4m X 5m, but still conceivable in a ships compartment.
Kind of makes you wonder how many more people have survived a shipwreck only to sit on the bottom of the sea and die slowly.
The divers put a diving helmet and harness onto him and he followed the diver to the bell were he was then taken to deck level and kept in the chamber and decompressed for 2 days.
The boat sank in tropical waters. My computer usually says ~27º C (~81ºF), so I don't think exposure was a primary concern.
Interesting, when I read the story, I did not have in my minds eye the darkness. That would have pushed me into panic mode for sure. As we all know keeping your head when things go bad is a major key to survival. Great lesson.