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The Titan submersible went missing during a deep sea underwater excursion near the wreckage of the Titanic in the Atlantic Ocean in June 2023. Its debris were discovered four days later by a remotely operated underwater vehicle.
The mysterious sounds were picked up by Canadian aircraft that dropped sonobuoys in the area of the missing Titan submersible.
Played for the first time in a new documentary, the sound has a regular, steady beat which caught the attention of experts - and sparked hopes that they could be SOS signals from those on board.
The audio of the 'banging' sound, initially providing hope for those trapped inside the doomed Titan submersible bound to the wreck of the Titanic, is revealed
The Titan imploded after losing contact with its mother ship while on an expedition to investigate the wreckage of the Titanic.