While it’s obvious that it failed because they ignored safety regulations and certifications that are in place for a reason, it is still important to prove with physical evidence so they know 100% without a doubt. This would officially serve as a warning to other egotistic innovator wannabes who want to cut corners.

I think some of it is to fully understand the failure mechanism.

While it’s pretty painfully obvious lesson being make your sub have standard safety equipment and don’t use proven terrible ideas when making well tbh anything it’s while a formality to investigate the wreck of the possible crime it’s a formality needed to see who is at fault like yea it’s likely that this sub imploded due to it’s many flaws there is the off chance that maybe it imploded because of something that any sub would struggle with it’s best for society to have a unbiased view that doesn’t jump to conclusions when judging even the dumbest of morons like Stockton rush

To try and prevent something similar in the future.

yeah, does seem a bit excessive. unless the goal was to retrieve like a black box for info, there is an entire ship down there, hardly seems like leaving one small tube makes a difference