spelunk

[spi-luhngk]
verb (used without object)
to explore caves, especially as a hobby.

Origin:
back formation from spelunker, spelunking

Dictionary.com Unabridged

spelunker

[spi-luhng-ker]
noun
a person who explores caves, especially as a hobby.

Origin:
1940–45; < Latin spēlunc(a) cave (≪ Greek spêlynx, stem spēlyng-, akin to spḗlaion; cf. spelaean) + -er1

spelunking, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
spelunker (spɪˈlʌŋkə)
 
n
a person whose hobby is the exploration and study of caves
 
[C20: from Latin spēlunca, from Greek spēlunx a cave]
 
spe'lunking
 
n

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Etymonline
Word Origin & History

spelunker
"a cave bug; one who explores caves as a hobby," 1942, formed from obs. spelunk "cave, cavern" (c.1300), from O.Fr. spelunque, from L. spelunca "a cave, cavern, grotto," from Gk. spelynx (gen. spelyngos). An adjective, speluncar "of a cave" is recorded from 1855.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Well, he didn't have the energy to go spelunking tonight.
There are several caverns for spelunking in the hills.
Take advantage of this well-kept secret by practicing your spelunking there
  sooner rather than later.
Some of the past trips have included spelunking, white water rafting, horseback
  riding and hot-air balloon riding.
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