I wonder if this guy realizes how cost prohibitive building a sub that can dive that deep would be....
You couldn’t possibly recoup the cost of building it with sub tourism.
With the pressure that goes along with that depth, if something were to happen there won't be anything left of the "black box".......let alone retrieving it.
Were it even remotely possible, it would take a nation state budget to build one of those things. Considering the pressures involved, it would probably be more expensive than a space shuttle (complete with boosters and launch set-up).
Tourism? Voyage to the Bottom of the Sea?
Not in our lifetimes, I reckon.