I have no experience diving in caves, I just read about it on the internet, but this stuck out at me:<p>&gt; But after descending about 85m Kankanen returned. Looking upset, he explains in the film that he slept badly and is simply not in the right frame of mind for the operation.<p>This happened on the retrial mission, but it hints very softly at the culture in which this group of people went cave diving.<p>I interpret the comment about not having to have died in the first place, as meaning that cave diving is extremely dangerous, and so planning and execution need to be perfect and require a great deal of mental control.<p>The first person died after he got entangled by some cord, and then after panicking being unable to switch to a fresh air supply. Why the second diver died is unclear. So maybe they weren&#x27;t in the right frame of mind to deal well enough with running into dangerous problems at depth.