A former employee of OceanGate - the company that operates the missing Titan submersible - warned of potential safety problems with the vessel as far back as 2018.

US court documents show that David Lochridge, the company's Director of Marine Operations, had raised concerns in an inspection report.

The report "identified numerous issues that posed serious safety concerns", according to the documents, including the way the hull had been tested.

A spokesman for OceanGate declined to comment on the safety issues raised.

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