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.
Thing is, as James Cameron pointed out in his interviews, this is not a cutting-edge field. The science of submersibles is well explored and the technologies are mature. Engineers know exactly how to construct a safe submersible to go as deep as you want. There are companies like this that make and sell these submersibles.
This guy was not doing research or experimentation. He was trying to cut costs because he probably couldn’t afford a proper submersible under his business model and still make a profit. The only reason for using unconventional materials - materials that are well known to be unsuitable for this purpose - was that he thought he could do it more cheaply if he didn’t go through safety certification or buy a sub that had already been certified.