Journey Beneath The Desert (1961)

aka’s: Antinea, L’amante Della Città Sepolta/L’ Atlantide/Siren Of Atlantis

A helicopter crashes in the desert, and the crew winds up in the underground city of Atlantis and get mixed up in a slave revolt. Stars Jean-Louis Trintignant, Haya Harareet and Georges Rivière. Also with Gabriele Tinti.