This natural earthen tunnel looks like it has been bored out by the

long and tedious use of shovels and picks. The raw walls and floor

have been heavily packed and reinforced with wooden beams to prevent

cave-ins. Straggling roots hang in clumps from the ceiling, and the

ground reveals the imprint of many footprints. A large hole has been

dug in the floor, and an iron ladder leads down through it.