spelunker

noun

1. (Canada, US)One who explores caves; one who spelunks.

   “I took to fishing, on mountain brooks and lakes, and finally I was inveigled into becoming a spelunker. A spelunker is a human worm who crawls into caves ("splunca" is Latin for cave) and explores them.”

2. (derogatory)An amateur or inadequately prepared caver.

   “I am officially a spelunker – but not yet a caver. The dictionary definition of spelunking is “exploring caves for sport.” Serious enthusiasts shun the term, however. They are cavers. A spelunker is an inexperienced amateur. On this dry and balmy mid-November Saturday, our group contains three spelunkers and two cavers.”

   “But the scariest of all’s the witless caver; Spelunker is the name that he goes by. He caves alone with just one light, A worn-out rope, and boots too tight, Looking for a cave in which to die.”

   “it is a truth that every caver was once a spelunker with a flashlight and a tangled ball of string.”

   ““‘Cavers,’” the editor notes, “generally consider ‘spelunkers’ to be people who have no real knowledge or understanding of caves and caving safety, but who decide to enter a cave anyway, usually without proper equipment.””