New audio has surfaced in relation to the search efforts for the passengers aboard the ill-fated Titan submersible.
A desperate search for five onboard passengers was launched after the sub lost contact with its mothership and vanished during an expedition to the Titanic wreck on June 18th, 2023.
For the first time, the chilling 'banging' sound which kept hopes alive for both families and rescuers during the search can be heard in a new documentary.
Late into the second day of the search, families and loved ones anxiously awaited updates, but felt a ray of hope when banging noises were detected deep under the ocean in 30-minute intervals.
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The sound is described to be hollow with a steady beat, catching the attention of the search party, and sparking hopes that it could be SOS signals from the stranded crew.
The haunting noise was first recorded at around 11.30pm on June 20th, and was confirmed by the US Navy the following morning.
'It could be somebody knocking, the symmetry between those knockings is very unusual,' former Navy Submarine Captain Ryan Ramsey said in the upcoming documentary.
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'It's rhythmic, it's like somebody is making that sound, and the fact that it is repeated is really unusual.'
Coast Guard Captain Jamie Frederick admitted at the time: 'With respect to the noises, specifically, we don't know what they are, to be frank with you.'
Professor Emeritus of Earth and Environmental Sciences at Syracuse University, Jeff Karson, said that the sounds heard were likely to be 'wishful thinking' at the time.
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The Titan sub imploded as a result of enormous water pressure pushing down on the vessel - killing everyone on board in a matter of milliseconds.
After days of searching, the Pelagic search team’s submersible, Odysseus 6K, reached the seafloor and discovered sub debris around 1,600 feet from the Titanic's bow.
Ten days after the disappearance, the Coast Guard declared that ‘presumed human remains’ had been found in the wreckage.
The onboard tourists; Hamish Harding, Shahzada Dawood and his son Sulaiman Dawood, French Navy pilot Paul-Henry Nargeolet and OceanGate CEO Stockton Rush tragically lost their lives almost instantaneously.
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The new documentary will be released in June this year to mark a year since the tragedy in June and will go behind the scenes of the multi-million dollar search operation.