James Cameron reacts sub implosion: 'I'm struck by the similarity of the Titanic disaster itself'
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Film director James Cameron has expertise in designing and testing these submersibles, and he has many criticisms of the design of the sub that imploded, and of the hubris of the CEO who ignored repeated safety warnings from the diving community. He also mentions that the sub seems to have been attempting to resurface when it imploded, suggesting that they were aware the hull was starting to fail.
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Shit, in all this time I hadn't considered the middle of the road option between "dying immediately without knowing" and "slowly choking to death over several days": dying but knowing that's a big possibility right up until you're crushed in the blink of an eye...
Yeah, if they were resurfacing it must have been bad and readily apparent. Based on the hubris of the COE, I imagine he would be quick to handwave away any signs of problems. Not only was he willfully against safety inspections and so forth, but he knew if he had to abandon a trip due to a concern that his brilliantly engineered sub was breaking, he'd be proving all the nay-sayers right. If it got to the point that the COE decided it was time to turn around, it had to be bad. There is also probably a decent chance that he was on notice and could have abandoned the dive earlier and maybe saved everyone on board, but was motivated to keep pushing lest he be met with a chorus of "I told you so" from the diving community. At any rate, if its true they were trying to resurface, they knew and likely spent their last moments terrified.
That sounds tremendously right...
So, this
Probably less dramatic. You're not going to get a spray of water; if water's coming in, it's coming in at over mach 3, and implosion would happen in milliseconds. Cracking like that would also be pretty unlikely. It's more likely that they thought that it was just "an abundance of caution."