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Holly Bishop | Thursday 19 June 2025 14:38 BST

The doomed Titan sub can be heard making popping sounds on a previous dive before the fatal implosion killed all five passengers onboard the vessel on 18 June 2023.

Footage from the Netflix documentary Titan: The OceanGate Submersible Disaster shows CEO Stockton Rush inside the sub on a test run as he describes hearing some “attenion-grabbing pops”.

Eerie thumps can be heard coming from the carbon fiber hull, which were explained in the documentary to be tiny fibres snapping when the sub was under great pressure.