U-3 will be encountered during chapter 5-3 at the Luggage containers area. During the initial encounter U-3 can not be killed, the player must navigate and escape the three containers while avoiding the monster. There are three containers, the player can only move from one to the next by locating the two emergency switches and then heading for the exit. When both switches have been pressed, the container will drop after 30 seconds. Not escaping results in death.