Oblivion

In a post-apocalyptic future, Earth has been devastated by war against aliens and humanity has moved to Titan, leaving a few technicians to monitor the machinery that extracts the planet’s last resources. Two of these operators discover a crashed capsule containing Earth astronauts who left decades earlier, whom the system inexplicably identifies as hostile. The encounter prompts them to question everything they know about the war, their mission, and the true nature of the enemy.
At the 26th minute, Andrea Riseborough walks towards a swimming pool. When she reaches the edge, the actress drops her dress to the ground, remaining totally naked, framed from behind. Andrea dives in and shortly afterwards a man joins her and jumps into the water to hug and kiss her.