Sinkhole may exhibit a visible opening into a cave below. In the case of exceptionally large sinkholes, such as the Minyé sinkhole in Papua New Guinea or Cedar Sink at Mammoth Cave National Park in Kentucky, an underground stream or river may be visible across its bottom flowing from one side to the other. Sinkholes are common where the rock below the land surface is limestone or other carbonate rock, salt beds, or in other soluble rocks, such as gypsum, that can be dissolved naturally by circulating ground water. Sinkholes also occur in sandstone and quartzite terrains. As the rock dissolves,
Into the Void (Nine Inch Nails song) Into the Void (Nine Inch Nails song) "Into the Void" is a song by American industrial rock band Nine Inch Nails from their third studio album, "The Fragile", released in 1999. It is the album's third single and saw release early 2000. A music video was directed by Walter Stern and Jeff Richter. "Into the Void" has been covered by Eric Gorfain, Skorbut, Kalte Farben and Wormhole. The song was featured in the 2000 film "Final Destination", being played on the radio in Carter Horton's '71 Chevy Nova, before one of the characters is killed. Even though the song was