New evidence strongly suggests that OceanGate’s submersible, which imploded and killed all passengers on its way to the Titanic wreck, was unfit for the journey. The CEO, Stockton Rush, bought discounted carbon fiber past its shelf life from Boeing, which experts say is a terrible choice for a deep-sea vessel. This likely played a role in the submersible’s tragic demise.
Fresh from the factory might have got away with it, they tried to reuse a vessel that was barely useable for 1 journey and had known material flaws that would have limited the number of pressurisation cycles the craft could have taken.
The CEO fired the employee who warned him that the sub was unsafe and needed more stringent testing.
https://www.cbsnews.com/news/titanic-submarine-oceangate-hull-safety-lawsuit/
The submarine had successfully dived down to the Titanic before. Carbon fiber may be the wrong material for the job but it’s gets weaker the more strain it goes through. Even in 2017 experts knew it was a terrible idea.