User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5043481-20130226183601/@comment-6005381-20130302115114

We don't know the exact chemical make up of the rock so it's properties are unknowable (exept the tower as it is capably of bearing weight) the best indication is that a hunter can break the rock with a weapon or pickaxe. So in the end I think it's best to go with Democide's theory as it can apply for almost all rock type.

There is one problem tho. How the hell can the lavisioth subs swim througth the tower? at the vey least they would annialate the foundations anyway due to the're massive size!