jdreyer wrote on Aug 7, 2024, 18:20:
On the previous model of the Titan, there was cracking and popping that forced the crew to surface. No way to prove that was the case here, but that would be extremely nerve-wracking. No black box recorder was on board.

James Cameron indicated that it was likely that the submersible's early warning system alerted the passengers to an impending delamination of the hull.[83]: 08:05  He added "we understand from inside the community that they had dropped their ascent weights and were coming up, trying to manage an emergency."[83]: 08:13  Simulations suggest the implosion of the vessel took less than one second, likely only tens of milliseconds, faster than the brain can process information; there would not have been time for the victims to experience the collapse of the hull, and they would have died immediately. From the wiki