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  • In the early 1990s researchers lowered a video camera into Old Faithful’s vent. The camera was equipped with a lighting system
    and monitors to record temperatures.

    . At the surface, the geyser's vent measures 2 by 3.5 feet (.6 by 1 m). Along its length, the walls of the conduit are covered with rough deposits of silica.

    . About 22 feet (6.7 m) underground, the plumbing system of Old Faithful shrinks to only a few inches wide.

    . At approximately 24 feet (7.3 m), the camera revealed a small waterfall of relatively cool water that is thought to be groundwater finding its way into the conduit.

    . A large cavern, estimated to be the size of a small automobile, lies between 35 to 45 feet (7-11 m) inside Old Faithful.

    . The camera couldn't be lowered much farther because it encountered a slot filled with boiling, wildly churning water at the lower end of the cavern. The researchers reported that the action resembled a "liquid tornado."

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    This work is supported by

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