caver

Etymology

From cave + -er.

noun

1. A person who explores caves.
   Pam has been caving for 25 years. She and her husband Tim are among the top cavers in the country. They are passionate about the world hidden beneath our feet and they were to be my instructors and guides on my first ever foray below ground that didn't involve getting on the tube. 2007-09-29, Kate Humble, “What lies beneath”, in The Guardian
2. (mining, obsolete) One who works the tailings of a mine to extract small pieces of marketable ore.