Our apprehension is that the current experimental approach adopted by Oceangate could result in negative outcomes (from minor to catastrophic) that would have serious consequences for everyone in the industry.
...
However, we recommend that at a minimum you institute a prototype testing program that is reviewed and witnessed by DNV-GL (or ABS). While this may demand additional time and expense, it is our unanimous view that this validation process by a third-party is a critical component in the safeguards that protect all submersible occupants.
https://int.nyt.com/data/documenttools/ ... 4/full.pdf