A challenge in the Friendship Gulag. At night, walk by a guard tower. When loaders appear on top of it, the challenge should pop. This challenge is worth 1 Badass Rank.
When arriving in the Gulag at night, the spotlights on the towers may not light up. This can be remedied by saving and quitting the game inside the Gulag, reloading and waiting for night to fall while still inside the zone.