EAn aircraft from Canada that was looking for the lost Titan submarine in the Atlantic Ocean heard sporadic "banging" sounds close to where the divers were last seen. Internal emails sent to the Department of Homeland Security's top officials were used to inform them of this revelation.

Every 30 minutes on Tuesday, the team hunting for the missing sub heard banging noises; four hours later, when more sonar devices had been deployed, the crew heard the hammering noises once more.

On board the Ocean Gate Expeditions submersible titans are CEO and founder Stockton Rush, British millionaire adventurer Hamish Harding, renowned French diver Paul-Henri Nargeolet, Pakistani businessman Shahzada Dawood, and his 19-year-old son Suleman Dawood.

On Sunday morning, the Canadian research vessel Polar Prince, the watercraft's backup vessel, sunk. The Titan lost touch with Polar Prince one hour and forty-five minutes later, according to the authorities. The Titan has enough oxygen on board to last for four days. Only 24 hours of oxygen are thought to be available to the five missing passengers on the ship.