Tunneling

[NJHunkguy]

Originally Posted by Byron

Didn't know BC has subsurface fissures like NZ and Iceland.
(tris coming on I see)

With mountain ranges that high, it had certainly take huge amount of force to create them in a long.... time. Understandably there would be much Earth’s crust and voids beneath.

http://www.mountainnature.com/geology/HotSprings.htm