In underground concrete shelters, in a world left standing amid the ashes of a nuclear apocalypse, time can only flow backward. In this short film set amid the ruins of Paris, Chris Marker opens a corridor of memory woven not from moving images but from still photographs. In underground laboratories, people search for a way to save the future by sifting through the fragments of the past. This journey through time, built upon the memory of Paris Orly Airport, holds a fragile love story that emerges amid radioactive rubble.