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Titanic tourist sub photos show wreckage being brought ashore
(www.bbc.co.uk)
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Yeah, I've read how experts stated that the point where the dissimilar materials meet would be the most likely location of the failure. Titanium and carbon fiber will certainly behave differently under that pressure.
I think it's far less likely to be the root cause, but I do wonder if the 380mm acrylic viewport had anything to do with the failure. It wasn't rated for anywhere near that depth.