After getting to the ladder, ignore Anna for a moment and examine the end part of the runnel.
Now return to the ladder.
Put on a gas mask and climb up the ladder, thus getting to the surface.
After getting closer you’ll be attacked by three mutants.
Use the shotgun to eliminate opponents, since it has a big firepower.
Prepare for attacks of two more waves of monsters.
Good news is that Anna will help you to kill them, so do not worry too much.
After the battle check whether Artyom is hurt and use the medkit if needed.
Head towards the crater, reaching after few moments a place where the Dark One is hiding.
Do not attempt to attack this creature, because it will start fleeing and this is scripted behavior.
Keep chasing the Dark One.
The game will allow you to catch it only after getting to the area shown on the screen.
It would be good to use here a close/mid range weapon.
Watch a series of cutscenes, which end the second game chapter.
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