They were flown to Lebanon to ski the unlikely snow, sail the Mediterranean, spelunk the Jeita cave.
-- Kim Barnes, In the Kingdom of Men. 2012
The pair of young German professors spelunking with their electric torches in the rafters of the Old-New Synagogue, or Altneuschul, had, as it happened, gone away disappointed; for the attic under the stair-stepped gables of the old Gothic synagogue was a cenotaph.
-- Michael Chabon, The Amazing Adventures of Kavalier & Clay, 2000
Spelunk entered English in the 1300s from the Latin spelunca meaning "cave" or "cavern."