City Beneath the Sea

City Beneath the Sea is a 1971 adventure science fiction television film and television pilot for a proposed series by Irwin Allen starring Stuart Whitman and Robert Colbert. It began as a conceptual 10-minute demo reel as a means to sell the plot and concept to television studios. The concept was not bought initially, and a few years later Allen produced a two-hour telefilm for NBC. The two-hour movie again failed to gain the response necessary to be picked up as a series. In the UK it was shown theatrically in 1972 as One Hour to Doomsday.