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Like how Nordwand was "inspired" by an ill-fated attempt to scale the Eiger, I suppose.According to IMDB, the movie was "inspired by the lives of Jacques Mayol and Enzo Maiorca," two real-life competitive divers. Perhaps that makes the characters more plausible?
I didn't read up Grand Blue before I made my earlier comment, that was just my reaction immediately after watching it. Knowing it was based on real people doesn't really make the characters any more believable, especially after reading about Mayol's life, which is pretty different from what we see in the film, though it's worth noting that he helped write the screenplay. Perhaps it was the depiction of the characters I took as implausible, or the way the story was presented. It was long and plodding and I found it far less interesting and more time-consuming than reading up on the real Mayol, who made several contributions to freediving that were barely touched on by the film.
Downloading a few others mentioned here, hoping to have more luck. The documentary recommendations are all great, with some amazing footage!