https://www.eastbaytimes.com/2023/06/23/questions-emerge-about-titanic-bound-subs-regulation-as-investigators-hunt-for-reason-it-imploded/

By PATRICK WHITTLE (Associated Press)

Authorities hunted Friday for the reason a submersible carrying people to the wreck of the Titanic imploded deep in the North Atlantic, as questions emerged about how such expeditions are regulated and tributes poured in for the five aboard who were killed.