Spelunker

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.

Source: wiktionary

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.

Source: wiktionary

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.

Source: wiktionary

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

Source: wiktionary