Again, a random people wake you up. Pack your things and head out.
The arrow on the wall show where you should go. If you still lost in this place, open your journal (usually M key for PC version of Metro 2033).
Some people may ask for help. If you willing to help them, you'll get positive moral point. Moral point will determine how the game ends. So be nice to get a good ending. Otherwise, just play like usual to get normal ending.
Meet this guy. He'll give you some weapons. Without weapon, how you gonna have some fun. :D
You can actually steal military ammo from this guy. But it'll reduce your moral points.
Go to this guy room to proceed..
End this subchapter by talking to this guy. [End of subchapter]