Lavatubing

Walking, hiking, crawling, or climbing through an ancient lava tube which is now free of lava flow, such as Ape Cave at Mount St. Helens. Probably involves the use of headlamps or flashlights.

Guy 1: "Hey man, what did you do this weekend?"
Guy 2: "Went lavatubing. It was awesome, I got cave bacteria all over my hands."

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