>why would they risk a tiny sub and not get a real sub to be safe with all the money they had?
SMH… because PHYSICS. maybe read a book?
the wreck of the titanic is 12,000 ft deep
the crush depth of a "real sub" is a few thousand feet
deep sea submersibles capable of reaching 12,000 are tiny because that's as big as they can be made
fucking DUH!