A submersible carrying five people has gone missing while on a tour of the underwater wreckage of the Titanic off the coast of Newfoundland, Canada. The deep-sea vessel, operated by OceanGate Expeditions, lost contact about an hour and 45 minutes after submerging on Sunday morning with a 96-hour oxygen supply. Rescue teams have detected noises in the search area that could indicate signs of life, but the source of the sounds is still unclear. The search is complicated by the remoteness of the location and the depth of the water, which is about 13,000 feet. The submersible, named Titan, is one of the few vehicles that can withstand the extreme pressure and cold at the Titanic wreck site. The passengers on board include a British billionaire and adventure traveler, Hamish Harding, and four mission specialists who paid $125,000 each for the expedition. The fate of the missing sub and its crew remains uncertain as time runs out.