>>211649928Only the most expensive one in your screenshot could reach the Titanic. Even ignoring purchase cost, the problem was weight. You need a huge fucking boat to haul around a big metal sub and that's even more expensive.
He wanted to build a lightweight sub out of carbon fiber so he could have a lighter, cheaper boat haul it around.
There may even be some carbon fiber composite or design using carbon fiber in some places that works. The main problem was that if you don't have the money for a full deep sea operation using existing vehicles, you don't have the money to fund deep sea vehicle R&D, and you definitely don't have the money to see it fail.