Blue Hole (Red Sea)
The Blue Hole is a diving location on the southeast Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.
Black Hole (roller coaster)
Black Hole was an enclosed steel roller coaster at Alton Towers in Staffordshire, England. It operated from 1984 until 2005. The coaster was located within a huge black tent (formerly green and yellow) that ensured the ride took place in total darkness. The coaster itself was a Jet Star II, designed by Anton Schwarzkopf. During the time that the ride operated, the park also operated a similar outdoor Jet Star III coaster, the Beast.