>>66739415Heating’s useful but once you go deep enough (I see someone mention it starts around 100 ft but I also see some metro stations at 400 ft deep still having a cozy temperature) it starts getting hot again. I don’t know if we can build a huge AC to vent the heat to surface and keep the deep underground inhabitable
There are also other things like air and water that needs pumping and I think those actually were how steam power started being used on a large scale
