Search and rescue teams trying to track down the missing Titanic submersible heard "banging" sounds as they were searching the area, which suggests it could be on the surface. However, even if it isn't at the bottom of the ocean, those inside still have limited time remaining as the vessel is bolted shut from the outside.
Authorities are focusing their search efforts after "banging" noises were detected with sonar, however the US Coast Guard has warned they "don't know the source" of the banging.
The sounds were picked up by the Canadian P-3 aircraft as underwater operations were underway to try and locate the origin of the noises. The sounds were detected in the search area for the missing submarine, which was carrying five passengers when it lost contact while visiting the Titanic wreck on Sunday, June 18.
