Key points of Wolfenstein The New Order - Berlin Catacombs
Letter
M - Map
Armor Upgrade
Enigma Code
Health Upgrade
Gold
Enigma Code 1 / Gold 1 / Letter 1
The entrance to the side tunnel, between the first and the second grate
The golden book and code 3:2 are in the same location. After you open the first grate, keep to the left wall. You should be able to locate a small hole. Leave your vehicle and swim inside. After a while, you will reach a room with the items inside.
Sewer map
Before you raise the water level
Next to the mechanism for raising water level, on the barrel.
Gold 2
The golden lamp behind the second turbine
After you raise the water levels, return and swim through the second turbine. Then, along the big pipe on the left. On the left, find a room with a golden lamp inside.
Gold 3
In one of the tunnels past the second turbine
Close to "Gold 2", deep underwater, inside one of the big, round pipes coming out of the room, there is a golden snake.
Gold 4
Right past the second turbine, as seen on the screenshot
Right after the water level raises, backtrack and swim through the second turbine. On the right, on the underground elevation, there is a golden ladle.
Enigma Code 2
The entrance to the room with the code
After the water level raises, return to the first ladder, swim ahead and look for an entrance that looks similar (just with a derelict ladder) to the room with the lever. On the upper floor, there is code 3:3.
Health upgrade 1
The a safe under the water
After the compound is flooded, jump into the big pool ahead of you and find the safe on the right, at the bottom. Inside, there is a statue.
Enigma Code 3
On one of these crates
After you have unlocked passage with the naval mine, enter the tunnel and turn left immediately. Next to the barrier, on the crates, there is code 3:4.
Armor upgrade 1
A bit ahead and to the left
After you have unlocked access with the navel mine, enter the tunnel and come out of water, to the right. There, you will find the door that you can open by picking the lock. Inside, there is a statue.
Enigma Code 4
After you smash the second passage with the mine, ahead and to the left
After you have unlocked the passage with the mine. Remember that you need to release two mines that are side-by-side. Simply, ahead for the whole time, through the big, round pool and to the second open pipe. There, on the self at the door, there is code 3:5.
Enigma Code 5
Jump into the hole in this grate
After you come out of water, after the action with the mine. Find a smaller, round room and jump into the hole in the ground and, after you climb up the ladder, obtain code 3:6 from the shelf.
Gold 5
Gold next to a stack of crates
After you find Enigma Code 5, in the room on the ground, there is a golden necklace.
Enigma Code 6
At the railway tracks and the train
After you spot two officers, under the catwalk, next to the train, there is code 3:7.
Enigma Code 7
There are numbers on the gates
After you kill the two officers, inside, between gates 1 and 2, there is code 3:8.
Enigma Code 8
In the control room, after pressing of which, hell breaks loose
After you kill the two officers and press the button that opens the gate (an armored Nazi runs out, as soon as you press it), run up the stairs and enter the big control room. Code 3:9 is on the control panel.