What are stalactites spelunkers?

Nonsense question.

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A stalactite is a calcite formation within a cave.

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A "Spelunker" was originally a "caver" - a person who explores caves - and was coined by a couple of American cavers in the 1930s, not used at all outside the USA, and now used, if at all, only in a derogatory way by US cavers of novices and dilettantes. (I took the trouble to investigate it!)