Amnesia: The Bunker

Traps are tripwires found throughout the bunker and can be disarmed by using the cutters (hold , then click to use).

The cutters are found in the Prison, in the cell the German soldier is in. You need to have the wrench in your inventory and make sure the generator is on.

To open the cell you need to destroy the wooden door on the right (if you're facing the cells) with a brick, grenade, or getting lucky with the beast hitting it, and then open a grate to the right with the wrench and crawl through.

Use the switchboard in front of the window and click the second from the top on the right side to open his cell. The beast will be attracted to his screaming, but if you've got a bullet and you're quick, you can run down, shoot it to scare it off, grab the cutters, and run back to the switchboard to close his cell again and also unlock the Life Preserver achievement.