Walkthrough: Start off by examining a body found directly in front of you #1. Collect ammunition from this body and then turn left. You should be able to locate a small hole located under the stairs #2.
Go through the hole and it won't take long until you've discovered a new body #1. Take standard ammunition, as well as 15 rounds of gold ammunition. Return to the starting point and this time choose a passageway located to the right of the first body #2. You'll have to move quickly here, because the area is irradiated.
Continue moving forward until you come across a junction. Take the ammo found nearby and then head up the stairs #1. It shouldn't take long until you've discovered a new body. Check it to find supplies and 2 rounds of gold ammunition #2. Head back down and proceed towards the unexplored passageway.
Turn left as soon as you've entered a new area and crawl through a small crack in the concrete wall #1. You'll have to act quickly again so that your character won't be killed by large doses of radiation. Take gas mask filters, standard ammunition and 5 rounds of gold ammunition from the chest #2. Return to the main chamber through the hole.
Use wooden beams found in the area to get through this location safely and keep heading towards a new body seen in the distance #1. Collect supplies and 20 rounds of gold ammunition before moving on. Turn right and use a new wooden beam #2 to get to an upper ledge.
It would be a good idea to check the area to your left. There's a new body there #1, however you would have to slide down to get to it and to collect ammunition. If you're not interested in examining the body head forward right away. You must be moving towards buildings seen in the distance #2.
Start off by exploring a small alley found to your right #1. Head on to the opposite end and you'll discover a new body #2. Don't be frightened by the beast and don't waste ammo on it. Instead collect additional supplies from the body.
Head forward and you should notice a bigger alley to your right #1. This is where you'll meet Bourbon. Start off by examining a body located close to your ally (ammunition) and then head over to a dead soldier located close to the grating #2 (you might have noticed him in the previous mission). Take gas mask filters, ammunition and two rounds of gold ammunition.
You may start following Bourbon #1, however after you've both reached a new junction proceed alone to your right #2. Check the stairs located close to a new building and you should discover a dead body with 2 rounds of gold ammunition.
Rejoin with your teammate again and proceed towards the stairs #1. Notice that Bourbon has taken cover behind a bus. Leave him here and start running towards a red garage structure seen in the distance #2. Check the corner to the right of the garage to find a dead body with a unique revolver and some ammunition. Return to your ally. You may ignore a flying beast seen in the area to conserve ammunition.
Make sure to choose a good weapon from your inventory, because you're about to be attacked by a large group of monsters #1. Don't forget to attack the monsters from a larger distance, use medical supplies when needed and prevent the beasts from surrounding Artyom. Wait for Bourbon to give a retreat command and follow him to a new building #2 where you'll be rewarded with a new cut-scene.