Hamish Harding

All five people aboard a submersible missing near the wreck of the Titanic died - likely in an instant - after their vessel suffered what the US Coast Guard said Thursday was a "catastrophic implosion" in the ocean depths.

There are five people in the submarine.
Contact with the small submarine was lost about an hour and 45 minutes after it dived on Sunday. A rescue operation has been launched, but so far there is no sign of the submarine, the BBC reported.
As of Monday afternoon, the crew were thought to have had about four days' worth of oxygen left.

Rescue teams raced against time on June 20 in their search for a tourist submersible that went missing near the wreck of the Titanic with five people on board.

One of the passengers on board has been identified as British businessman Hamish Harding, whose aviation firm had posted on social media about his expedition.

The US Coast Guard said late Monday that its search for a missing submersible vessel near the Titanic wreck had been completed for the day, but that a national guard unit and the company operating the five-passenger underwater mission would continue scouring the surface overnight.