Death by deep-sea implosion

An animation depicting what presumably happened to the crew of the Titan submersible that descended in 2023 to examine the wreckage of the Titanic.  

"Simulations developed in 2023 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, with no pain, as their bodies were crushed."

Tragic, but way better than death by asphyxiation.