TL:DR;
-Support Transfering Power Into Tunnel Surface
-Get rid of barren landscape by placing mine-able objects/entities within it
I really like the concept of this mod and the fact you can make actual curves and such while within the tunnel. My only issue with the mod, is you can't transfer power into the tunnel surface without having to build a power facility in it (Via shipping in the fuels and required items depending if you're using steam or nuclear, don't think solar works on this surface).
I would suggest adding the ability for tunnels to be able to transfer power from the surface into the tunnel world.
My other suggestion involves how the map is generated in the tunnel surface. At the moment it's just a barren desert in eternal night. I understand the lighting reason, but the fact it's a barren desert does some immersion breaking when thinking about how planets are, makes me think the game is on a hallow world with this mod enabled. So, to combat the barren landscape of the tunnel surface, I propose flooding the area with either mine-able rocks or a mine-able rock wall entity (Like what the Surfaces mod does for underground surfaces). This way the tunnels can feel a bit more authentic and give reason to work on the underground tunnel networks immersively.
