Is this the beef? > Since the water column is a mile high, it would pressurize the reactor by its sheer weight, much like sticking it a mile under the sea, so

Is this the beef? > Since the water column is a mile high, it would pressurize the reactor by its sheer weight, much like sticking it a mile under the sea, so no need for a pressurizer and the cooling system would be entirely passive. > In addition, being encased in solid rock far below any water table removes any need for a containment system. If things get really bad, fill in the shaft and cap it. Why is it cheaper to have this with a ready to activate shaft filling sarcophagus (and the redundant backup systems for that) vs doing it on the sea floor or land + a 0.1 mile deep hole?