Stockton Rush, the mastermind behind the Titan submersible expedition of 2023, didn't just want to tour the wreck of the Titanic - he intended to die there.

That's the disturbing claim made by a close friend of the late OceanGate CEO, who alleges that the multimillionaire engineer was suicidal and hellbent on writing himself into the mythology of the world's most infamous shipwreck, even if it meant sacrificing four others in the process.