The looking glass was only rated for 4,000 feet. Implosion happened around 9,000 feet, which would suggest the glass handled over twice its rated depth.
Pressure cookers that are rated for 15 PSI typically come apart at 75 PSI.
But that’s the thing about ratings. The manufacturer guarantees safe usage at 15 PSI and anything above that all bets are off and you’re on your own. Same with milk and expiration dates. Many times the milk is fine after the date, but the dairy won’t guarantee freshness and food safety.
Same for this looking glass. It says what the CEO thought about safety. He was willing to take chances and roll the dice. And every once in a while you get snake eyes. The consequences of rolling • • at 9,000ft of depth in the ocean is sadly instant soup. The water entering the vessel would likely be 5,000F degrees or so. While some people say it would be an instant death and not consciously detectable, I disagree. I think they were given just enough time for the brain to go oh shit, but only got to the oh part, and lights out.
