spe·le·ol·o·gy /ˌspiliˈɒlədʒi/
the exploration and study of caves.

Also, spe·lae·ol·o·gy.

[Origin: 1890-95; < L spélae(um) (see spelaean) + -o- + -logy]

-Related forms
spe·le·o·log·i·cal /ˌspiliəˈlɒdʒɪkəl/, adjective
spe·le·ol·o·gist, noun

Source: Dictionary.com.

Various ENT specialists have, at different times, embarked on major speleological expeditions into my nasal passages, but most of the have come back baffled. The ones who didn’t come back baffled didn’t come back at all, and are now part of the problem rather than part of the solution.

Source: The Salmon of Doubt, Douglas Adams.