Giving them the benefit of the doubt, they're saying the biggest problem with submersibles is operator error. Of course it is, when the classing system effectively eliminates the majority of mechanical failures. That doesn't mean the classing system is failing, on the contrary, it means its working.
Reminds me of some code that I've written which got passed off to other teams who ripped it out because all they saw was the complexity and they didn't recognize what issues it was preventing (Chesterton's Fence).
Code like that needs a 10 ft comment. I have been save by seeing those on otherwise “why the fuck is this needed” code.
If they if ignore the comment, well that is hubris.
I'm pretty good about doing that. I've gotten compliments before for a massive 10 line code comment above a-single-line-that-shall-not-be-deleted.
And yet they allowed passengers to control the sub. Theres a video out there where one of the passengers hit the ground with a loud thud while at the controls