Mushrooms in tunnels

I knew, of course, that mushrooms can be grown indoors, or otherwise under human cultivation. But I never considered the possibilities of disused transit tunnels.

Apparently different types of mushrooms prefer different temperatures, which makes sense. This one tunnel houses soil-based white button mushrooms, Cremini, Shimeji, Wood-ear, Shiitake, and Oyster mushrooms. But King Brown and Chestnut mushrooms require higher temperatures, so they are raised separately.

BLDBLOG has some interesting ideas about the subway tunnels under London, but the only subways I've used are in other countries, so I can't offer too much insight there.  It seems like some kinds of abandoned buildings might be able to be used in similar fashion, though.  Perhaps something could be done with some of those buildings in Detroit? 

Incidentally, shiitake mushrooms originate in China, despite the fact that we use the Japanese name. I had no idea "black forest mushroom" was just a synonym for "shiitake" either.