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> the entire carbon section of the hull could be considered a weak point

It is possible that the carbon fibre delaminated catastrophically, possibly as a result of stresses accumulated over multiple descents.

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The only way the carbon tube hasn't turned to sea dust is if the porthole failed first. When carbon fibre fails it catastrophically fails. I'd put money on the joint between the ti and carbon being the weak point and once there's a chip in the carbon under that much pressure it'll disintigrate.

fair points. Hopefully the investigation will nail the actual cause down.

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