He was heavily involved in the design and development of Deepsea Challenger (along with Ron Allum, the lead engineer).

One. That won a contest. Is it enough, or should he have designed multiple?

"Heavily involved" means what?

I would like to know details on the design and why specifically it's bad. Saying "it's poorly designed because Cameron says so" is not good enough. There is more detail in the YouTube videos from actual marine engineers on why specifically a carbon fiber hull is bad, why acoustic testing is insufficient, etc. They're not known and not relatable to the public yet more informative. That's my point.