http://en.wikipedia.org/wiki/Area_51#UFO_and_other_conspiracy_theories_concerning_Area_51 Many of the hypotheses concern underground facilities at Groom or at Papoose Lake, 8.5 miles south, and include claims of a transcontinental underground railroad system, a disappearing airstrip (nicknamed the "Cheshire Airstrip", after Lewis Carroll's Cheshire cat) which briefly appears when water is sprayed onto its camouflaged asphalt, and engineering based on alien technology. Publicly available satellite imagery, however, reveals clearly visible landing strips at Groom Dry Lake, but not at Papoose Lake.