James Cameron has done a huge number of truly amazing things, but he and Ed Harris both nearly drowned during filming of The Abyss. Hopefully he learned from his mistakes.

[1] https://collider.com/james-cameron-the-abyss-movie-productio...

Yeah not to say some of his knowledge isn’t hard won. Niels Bohr approved.

Looks like in Cameron’s case it was a double fault situation. No alarm on the primary, and the safety person didn’t check his emergency gear. That guy shouldn’t have been punched he should have been fired. And had his license suspended.