It was taking tourists to visit the Titanic in ~12,500 feet of water. Not likely a good outcome at that depth. Tickets are shown as $250k each. It holds 5, a pilot, a guide and 3 passengers.
https://www.bbc.com/news/world-us-canada-65953872 (https://www.bbc.com/news/world-us-canada-65953872)
2.5 miles under, you operating at the margin of margins. I am going to say a party of tourists and a single guide/ pilot are asking for something to go wrong. I hope everyone is ok, but we all know that Everest is covered with defeated millionaires.