The search for the missing submersible near the Titanic wreck has ended with the five people on board presumed to be lost. The intense water pressure at a depth of 12,500 feet where the wreck is located makes recovery operations impossible, according to experts. The pressure at the site is around 6,000 PSI, which is 400 times that of what most people are accustomed.
Even if there was a retrieval operation, it would be slow and arduous due to the underwater currents that could move debris, and equipment that could withstand such pressure is not currently available. The lost Titan submersible is assumed to have imploded due to a hull breach, causing the occupants to die instantly.