Exactly, the materials had no rated endurance, they had no idea of the dive cycle limit for that vessel. Even worse, WAY worse CF is terrible for compressive stresses, it is best used in tensile stress applications. CF is bad enough to justify negligent incompetence on the part of whoever came up with the idea.
I am at the point where if they find Boeing and/or the University of Washington (UW) did indeed have a part in designing that sub as Stockton claimed, they need a good legal enema!
Interestingly both are now denying any part of designing that sub which Stockton claimed, in videos, they did design it.
How ‘bout Boeing\U Washington engineering for air frame CF fuselage criteria was used to design the underwater craft. There was no direct design participation but the names and criteria could be hyped for a sales presentation?