caving
From Longman Dictionary of Contemporary EnglishRelated topics: Other sportscavingcav‧ing /ˈkeɪvɪŋ/ noun [uncountable] British English DSOthe sport of going into caves deep under the ground SYN spelunking American EnglishExamples from the Corpuscaving• Try adventure caving if you're really energetic!• Made from lightweight plastic it's ideal for camping or fishing but not really sturdy enough for caving.