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Carbon fiber is a great material for certain things like skis and bike frames. A submersible vehicle just isn't one application where carbon fiber is useful. The reason is the material micro fractures under stress. Sure, it's extremely strong. It's also very brittle. Every time it's put under extreme pressure, it flexes and creates new micro fractures. For skis and bike frames, this only becomes a problem after many years of use. Then the integrity starts to fail gradually.

In the case of the submersible, the failure will suddenly occur with no warning.

Carbon fiber is a great material for certain things like skis and bike frames. A submersible vehicle just isn't one application where carbon fiber is useful. The reason is the material micro fractures under stress. Sure, it's extremely strong. It's also very brittle. Every time it's put under extreme pressure, it flexes and creates new micro fractures. For skis and bike frames, this only becomes a problem after many years of use. Then the integrity starts to fail gradually. In the case of the submersible, the failure will suddenly occur with no warning.

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[–] • 1 pt

Oh yeah totally, i meant in that - if the ascent is 2 hrs back to the surface from 13000ft, and even if his fancy pants acoustic dinger chimed beforehand - that is a long time to hope and pray you reach the top with a 'critical infrastructure collapse impending'. Not sure how much that ascent process is sped up with all possible weight shed tho .