This is a response that, if made not in jest, is a signal of mendacity. Submersibles visited the Challenger Deep in the 1960s. We know how to build them, we kn

This is a response that, if made not in jest, is a signal of mendacity. Submersibles visited the Challenger Deep in the 1960s. We know how to build them, we know how to build them effectively, and we know many of the ways not to build them. "But we added tourists!" is not a meaningful factor here unless what you meant-but-wouldn't-say is "but we value engineered it!" in which case: yes, exactly, that's what safety rules are designed to put guardrails around.