Time running out for Titanic sub as search focuses on undersea sounds

FILE PHOTO: The Titan submersible, operated by OceanGate Expeditions to explore the wreckage of the sunken Titanic off the coast of Newfoundland, dives in an undated photograph. OceanGate Expeditions/Handout via REUTERS / FILE PHOTO

(Reuters) -Rescuers searching for a missing submersible near the wreck of the Titanic focused on Wednesday on a remote patch of the North Atlantic where undersea noises were detected, although officials cautioned the sounds may not have originated from the vessel.

With the submersible's air supply expected to run out in a matter of hours, an international search operation was sweeping a vast expanse of ocean for the Titan, which vanished on Sunday while carrying five people on a deep-sea tourist voyage to the world-famous, century-old shipwreck.