Find a way to use the elevator | Chapter 18: Undercity Metro: LL Guide

Start by searching all of the corpses and backpacks for supplies. I definitely recommend deploying all of the mines here that you have in stock. In a few moments, there will appear a large group of monsters here. After you get properly prepared, approach the big wooden elevator and pull the lever shown in the above screenshot.

While waiting for the elevator to arrive, you will have to fight another battle with the monsters. A good way to survive the attack, is to position yourself in one of the side-rooms that only one entrance leads to. As long as you are accurate while aiming at the mutants (shotgun or the double barreled shotgun) you will be able to deal with them quickly and without any problems.