Something that I found strange was the use of carbon fibre for the main pressure vessel. I was under the impression that the exceptional strength carbon fibre

Something that I found strange was the use of carbon fibre for the main pressure vessel. I was under the impression that the exceptional strength carbon fibre is only in tension, and that it isn't particularly good in compression. Why would OceanGate use carbon fibre? Other similar deep-diving submersibles used either steel or titanium, which are isotropic and have high compressive strengths.