Cassette Tapes
These are unmissable. Just grab the cassettes that appear in from of you and play them on the tape player.


-.- . -.-- (Morse code)
For this one you can either hear the morse code coming from the speaker and input it correctly on the machine or look at the wall (under the speaker) and you'll see the code written there.
For the "longs" press the button until the sound stops.
For the "shorts" just tap the button.


Key Finder
Pretty straight forward. Pick up the key and open the locker.


Break the loop
To break the loop just turn around and go throught the door.
Note that you'll have to do this a few times when going through the game.


Combination Found
In the last submarine sequence (the one with the finger print detector) you must find a valve, use it on a pipe in order to raise the water level in another room. In that room you'll be able to pick up a bottle. After you pick it up, drop it (using RMB) and grab the paper that was inside it. Memorize the numbers and input them on the safe found in the room with the table (use the numbers on your keyboard to do so).


The Butcher
You must use the key you found inside the safe to open a locker in one of the rooms in the submarine. There you'll find an axe. Make sure to return to the valve room and turn it again in order to lower the water level. Go to the room that had all the corpses and use the axe on the corpse that is further back.


The First Nuclear Winter
Look through the periscope and enjoy the nuke launch.


Catastrophe Avoided
In order to complete this achievement you must play through the creator's other game named Soviet Sub Takeover. It's free in Itch.io ( https://severodvinsk.itch.io/soviet-sub-takeover )
It's basically a memory game. Just remember where the enemies are and get ready to try over and over untill you finally manage to finish it.
After completing Soviet Sub Takeover you'll receive the nuke code. Write it down and go to First Winter. Assuming you've completed it before, just press "Continue" and you'll be placed in the last level. Do all the tasks until you enter the room where the periscope's at.
When you're inside, look at the computer and interact with it. Input the code and look through the periscope. A helicopter will appear and that's how you know you got the good ending.