Players will go through the Swamp region Stalker 2 heart of Chernobyl during Ad Astra Per Aspera's main mission to reach Clear Sky Base. At first glance, the Marshes may look like a region without much in the way of anything special, as they are mostly swamps and plains with little to no buildings. However, there is an old church that you can visit to find a hidden locked door that requires no code or key, but holds loot worth coming here for.
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Stalker 2: the code of the underground door is forest in the Yaniv district
Players in Stalker 2 can find an underground bunker in Lisov, located in Yanavsky district, with a locked door and will need a six-digit code for it.
How to open the locked door of the old church in the swamps
Players can find the Old Church by heading southeast of the Sultansk base in the direction of Balota district of Stalker 2 heart of Chernobyl. Although the building is abandoned, you visit it to disable the second PSI emitter during the Ad Astra Per Aspera mission. However, this locked door is not in the Old Church, but in the basement next to it.
This is how players can open the locked doors of the old church Stalker 2.
Reaching the locked doors of the old church
Facing the main church, turn left, crossing the marsh and entering the vaults. After going down the stairs, you will need to turn left and reveal a wooden locked door in front of you. The door may be locked, but does not require a key or code to enter. Everything is much easier.
Breaking wooden boards outside the door
To open the locked door of the old church, you'll need to head straight into the next room. Players will notice a a large crack in the wall in this room, and can see that the door is closed with wooden boards that break easily. You can either throw a grenade towards the door from the gap, which will destroy the wooden planks and open the door.
If you don't have grenades with you, try aiming your gun through the gap. Try to use the tilt to get the best angle on the wooden boards and shoot when the shot is knocked out. Once the boards are destroyed, the wooden door will be opened and players can go inside to grab the loot.
Rewards in the locked doors of the old church
Inside the locked room is a table with lots of loot. Here is a list of awards you get by opening the locked door of the old church Stalker 2.
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GP37 Assault Rifle
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Consumables for PSI units
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GP37 high capacity magazine nozzle
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Various types of ammunition, first aid kits and other consumables