Rescuers are expanding their search into deeper waters as they hunt for a submersible that went missing near the wreck of the Titanic.

The US Coast Guard and other search and rescue crews have swarmed a remote area in the Atlantic in search for the vessel, called Titan, which went missing on Sunday with five people on board.

Coast Guard Rear Admiral John Mauger told CNN: “As we continue on with this search … we’ve been working through the night with a broad group of partners to bring all capabilities to bear looking on both the surface and now expanding to a subsurface in the area.”

NATO rescue vessel cannot reach required depths – missing Titanic sub latest

Rescuers face a race against time to find the missing submersible as its oxygen supply dwindles.

It is understood from the vessel’s operator, OceanGate Expeditions, Titan had a 96-hour oxygen supply in case of emergencies – meaning that less than two days of “life support” remains.

The five people on board are British billionaire Hamish Harding, Pakistani businessman Shahzada Dawood and his son Suleman, chief executive and founder of OceanGate Expeditions Stockton Rush, and French submersible pilot Paul-Henri Nargeolet.