That's putting it harshly.
Would be interesting so see a statistic on deep water sub excursions versus fatalities. Probably somewhere between astronauts and WWII bomber crews.
There is little regulation for deep sea subs since they operate in international waters out of jurisdiction. You can pretty much do whatever the hell you want out there. If someone manufactures within jurisdiction, regulations may apply. Though they would be easy to circumvent.
Definitely good safety and engineering practice is written in blood, but regulations are not always enforceable.