the tunnel lv would be a also a map but beneath the supergrid and could have the same uses like mines did on the old map.
soem points
- tunnel entrance can only be build outside en not in cellars. it would take the space of a kiln.
- make underground city possible with more connections to the surface.
- tunnels benath rivers.
- mining gives 1 stone per tile.
- connection points can only be made by make a tunnelshaft at the surface.
- no cart and liftable objects can be carried inside.
tell your opinion about it
