La Jetée/The Pier (1962)
Earth lies in ruin after a nuclear war.
The few surviving humans begin researching time travel,
hoping to send someone back to the pre-war world for food, supplies and maybe a solution to their dire position.
One man is haunted by a vague childhood memory that will prove fateful.

Directed by Chris Marker. Starring Jean Négroni, Hélène Chatelain, Davos Hanich.