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This lava tube was created by a lava flow 1,900 years ago. Discovered in the late 1940s and first explored in the 1950s.

http://vulcan.wr.usgs.gov/Volcanoes/MSH/ApeCave/description_ape_cave.html
http://vulcan.wr.usgs.gov/Volcanoes/MSH/NatMonument/PointsInterest/map_msh_points_interest.html