Just finished reading King Rat, a novel that I've been meaning to read for sometime as it is set under London. This is becoming something of an obsession of mine and I believe they should be seen as a sub-sub-genre in their own right. I think an article should be written as subterranean literature has an excellent pedigree (think Jules Verne and going back even further the Greek myths).
I think I'll look in to it.
Read this week: King Rat by Chine Mielville