yes - but that's because there are big huge electric motors in there that spew out quite a bit of heat, as well as all the bodies, and the deeper (hotter) tunne

yes - but that's because there are big huge electric motors in there that spew out quite a bit of heat, as well as all the bodies, and the deeper (hotter) tunnels are very closed off. This is talking about digging down a few metres and having a loosely covered courtyard in the space, very different.