The Labyrinth under the Castle (...or is it under the Elephant?)

One of these days, I'll actually figure out my way around the Labyrinth of subways at Elephant and Castle, find all the hidden treasure, rescue a beautiful young maiden from the ogre and ride off into the sunset.

Well, either that, or I'll be eaten by the dragon somewhere between the Bakerloo line and New Kent Road, but somehow the first option seems much more appealing...