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.
How would they even stop people from doing something like this in international waters with willing participants?
According to encyclopedia Britannica, the laws of the country owning the vessel are applicable.
https://www.britannica.com/story/are-there-laws-on-the-high-seas