City Beneath the Sea (1971 film)
 City Beneath the Sea is a 1971 science fiction television film and television pilot for a proposed series by Irwin Allen. It started 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 but has remained a cult favorite amongst sci-fi and Irwin Allen fans.