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> Oceangate also started with unmanned test dives before they declared their submersible to be safe for humans.

They were reusing a material that is not safe to reuse that way. If they were only testing the design, it's unlikely anyone would be dead.

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Material selection is part of the design.

Selection and use.

Either "reusable carbon fiber" is the design, and you need to test what it takes to break that.

Or "single use carbon fiber" is the design, and you need a new hull each trip.

They did neither.

They didn't stress test the reusability before putting people on board, and that's both one of their biggest mistakes and one of their biggest differences from SpaceX.

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