3 other submersibles visiting Titanic almost suffered the same fate as Titan

 https://www.cbc.ca/news/canada/newfoundland-labrador/subs-titanic-expeditions-1.6887824

Any deep dive will always be potentially dangerous in such a foreboding environment. That's why safety standards need to be constantly improved.

https://desertshapes.blogspot.com/search?q=Titan+Sub

https://thedigitallabyrinth.blogspot.com/search?q=Titan+Sub