The Secret | Main missions Wolfenstein: TNO Guide

At this point, Anya will ask you for a concrete fragment, overgrown with mould, as well as for some documents. First of all, go down through the open door, which will take you to the hangar. There is the mould that you are after, next to Caroline, but you need a saw. You can find it to the left of the stone.

You need a saw to collect the concrete bit

If you try to pick up the saw, you will fall into the sewers. Keep going ahead and smash the turret on the grate there. Then, approach the wall on the right and squeeze across.

Even the sewers are guarded

In the next room, collect the health packs and armor, and go ahead. Finally, next to the door, there is a turret that you need to destroy. After you cross the door, you will encounter combat drones, but you will be able to collect the double-barreled shotgun, next to the door.

Keep going ahead and you will reach a round hole. Get around it and climb up the ladder to join up with your allies. Deal with the concrete fragment, then.

You still need the documents from the archives. First, check out the door on the ground floor, where Tekla is kneeling and it will turn out that Fergus took the keys. Pay a visit to him, at the first floor. With the key on you, return to the archives, collect the documents and take it back to Anya to complete this mission.