The Webster Avenue Borehole passage, when not half full of deep water, exhibits these charachteristics. It is over 3 miles in length. This image, highlighting several hundred feet of passage, was a tricky shot! Immediately before this image was made, one of my Tilt-a-mite flashbulb guns self destructed. These things come apart into about a million pieces of metal. Curtis Beasley (background) was standing in water getting progressively colder and I was feaverishly trying to hold this gun together to get one last parting shot. Because of my distance from the camera, I could not use the IR remote to trip the camera. Switching to self timer, I activated it and ran as fast as I could (note the slick mudbanks and rocks) to get into position. The IR filtered camera flash set off a slaved bulb to the left (and electronic T-32 to the right), which was our cue to set off the handheld bulbs. It's miraculous it all worked out...