All it takes is smallest crack or pinhole in hull
The vessel will implode faster than say “What the .......”
The Joint Rescue Coordination Centre in Halifax, Nova Scotia said the vessel was reported overdue around 9:13 p.m. Sunday, about 435 miles (700 kilometres) south of St. John’s, Newfoundland. Lt. Cmdr. Len Hickey said a Canadian Coast Guard vessel and military aircraft were assisting the search effort, which was being led by the U.S. Coast Guard in Boston.
https://www.youtube.com/watch?v=mQZPRM8vsFc
David Pogue, a CBS reporter who travelled in the Titan submersible last year, told the BBC about the issues that both the submersible crew and the land crew are likely to be experiencing, saying that there is currently “no way” to communicate with the vessel as neither GPS nor radio “work under water”.
“When the support ship is directly over the sub, they can send short text messages back and forth. Clearly those are no longer getting a response,” Mr Pogue said.
He added that because the passengers are sealed inside the vessel by bolts applied from the outside, “there’s no way to escape, even if you rise to the surface by yourself. You cannot get out of the sub without a crew on the outside letting you out.”
https://www.bbc.com/news/world-us-canada-65953872
Essentially like a fly and a fly swatter....................