Urban spelunker
The preferred current term is
Urban caving, 'spelunker,' a U.S. English term, having developed an amateurish connotation. A building hacker. Usually unauthorized explorer of steam tunnels, attics, air shafts, basements, abandoned buildings or military installations, and other areas generally off-limits to the public.
See also Urban exploration, Caving, Hacker, Reality Hacker
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