The original guy in that company had such hubris that it amazes me that he was an engineer at one point. Choosing materials for a submarine that didn't fit the role (carbon fiber sucks at compression), going cheap on those parts (Boeing QC-lot rejected carbon fiber lol), over-reliance on commercial-grade components like the gamepad for submarine control, and the general "safety is overrated" mentality that eventually hoisted his own petard.

The submarine wasn't designated seaworthy by any third party organization and even independent engineering analysts said years prior that structural failure was less of an if and more of a when.