Olympus OM-2S, 21mm lens, 1/60 second at f/3.5, T-32 electronic flash, handheld.
"Caver Curtis Beasley reaches the first ledge,
160 feet off the floor of the Rumble Room, on an ascent out of the chamber.
Looking directly down into the black void of the room, one cannot see the
floor or walls at all. Notice the precariously perched rocks at the
top fo the frame, and rotten, loose rock at the cavers knee pads."