The entrance to the “Blue Hole,” an underwater cave in Santa Rosa, New Mexico, has been blocked by a grate and inaccessible since 1976 when two students died trying to explore it. Since their tragic deaths, the cave has remained undisturbed by any humans. That was until last Friday when the grate was removed to allow divers from the ADM Exploration Foundation to explore the cave and map its interior.
By carrying a line into the cave with them, the divers measured the depth of the cave and how far apart landmarks inside it are located from each other. They also took video footage of the exploration, which they plan to use in a documentary film.
According to the New Mexico Bureau of Geology and Mineral Resources, the “Blue Hole” was formed when underground deposits of limestone and gypsum dissolved and created a sinkhole.
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