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My God what hubris. Rush had so many chances to pause the dive or work on a redesign and ignored it. I can't imagine the fear of being 3000+ feet below and hearing the first cracks of the hull as it starts to implode. Hope it was fast.
I don't think there were any cracks. Most probably it was, one second there is a submersible and everything seems fine, and the next second there is no submersible. And everything is still fine because we just got rid of a few billionaires for free, and didn't even have to use a guillotine.
I agree that we're talking milliseconds between the first crack and full implosion. Any cracks in carbon fiber will act as a stress concentrator which will cause more cracking in a rapid exponential process. There's a reason everyone else doing this said you can't use that material. Metal has some ductility so a very tiny crack normally won't cascade like that instantly.