titanic gawker submersible still missing.

[Anomalocaris]

I saw photos of the pressure hull under construction, with a carbon fiber laying machine laying layers of fiber in epoxy laminate. I am somewhat puzzled by the choice of carbon fiber composite for pressure hull. Carbon fiber is exceptionally strong in tension, but not particulate strong in compression. A pressure hull under seawater pressure will be all in compression. So why carbon fiber and not steel or titanium like every other manned deep sea submersible?

In addition, when placed in compression carbon fiber composite is subject to unexpected failure due to any difficult-to-detect de-lamination and other flaws in the composite matrix. Metal pressure vessels under compression experience no such vulnerability.