The Iron Rose (1973)

In a wedding party, a young couple meet each other and the man invites Karine to a date in the old train station to ride bicycle. When they decide to stop, they are near to a large cemetery and the man invites her to walk in the peaceful place with him. Then he invites her to go to an underground crypt to have sex, and they spend too much time inside. When they leave the crypt, it is night and the place is in the darkness. They try to find the exit of the cemetery and get lost inside. Along the night, their fear become madness with tragic consequences.