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Everyone knows exactly how it failed.
They used GLUE to stick carbon fiber to titanium.
All three of those components behave very different under pressure.
Every engineer warned them against the use of carbon fiber and the bonehead CEO insisted because he liked it.
It's literally an ego trip that got 5 people killed.
Obviously it would fail, yes, but where the failure started and how it propagated can still be interesting. There's a reason new car models get crash tested, you still want to double check the simulation results. Submarines don't usually get crush tested because they're built with huge safety margins instead, bigger margins than you can put in cars
What are you even talking about?
There is no technically beneficial reason to using carbon fiber in a submarine hull. It won't happen again, and it shouldn't have happened in the first place.
It's like making a car out of Swiss cheese, it's just pointless.
The data is not important.
Do you think the only place it would be useful is for other submarines? It's still materials science. Any place those same materials are used could in theory benefit (again, probably not anything notable, but data on how it behaves in extreme circumstances can be useful anyway)