If the impossible hasn't happened, my friend...
it was officially announced that all passengers on the submarine have died, and the reason, according to the latest reports, is that the submarine likely collided with something from the outside, leading to a system malfunction and an internal explosion. Some debris was found.
The strangest thing I heard is that the submarine didn't have, for example, a glass viewing area to see the outside; everything was through screens. So, a $250,000 per person journey just to watch the wreckage of the Titanic through a screen!