Another day another screen teaser!
It's hollowed out and inverted underneath the extruded terrain part's which I could probably make nice use of that and turn them into a inverted underground dungeon. The cool part is you could use all the bomb wall locations as entrances to that just use some hidden transparent walls like in Guk or Mistmoore Castle or a wall that slides open with a key like entrance into The Hole. Could potentially add in a invisible bridge like The Deep had below dungeon #4 to reach the tops of those cliffs that might be kinda cool.