MW4 DMZ / FIELD NOTES
MW4 DMZ key locations: every Hajin key room and grid
Where is the room that key opens? This page lists every locked key room and door on our Hajin map, area by area, with the Tac Map grid cell, one line on where it is, a link that opens the room on the map, and the source. Fourteen of the rooms were placed from TroubleChute Basics' key location videos, which we credit by name and link at the second his map shows the room.
Quick card
- Rooms listed
- 36 key rooms and doors on the Hajin map, grouped by area
- Each row
- Grid cell, where it is, a map link and the source
- Placed from video
- 14 rooms from TroubleChute Basics' key videos; 5 of them are new on our map
- Tested by us
- No. Positions come from creator footage and community maps
The short version
There are 36 locked key rooms and doors on our Hajin map. Each row below gives the room, its Tac Map grid cell, a line on where it is, a link that opens that room on the map with its pin selected, and who showed it. Use the search box to filter every table at once by a room, a place or a grid cell. A solid pin on the map is a room we placed on a building. A dashed ring is an area: we know the building or the floor, not the door. Where the Source column says TroubleChute Basics, the link opens his video at the second where his in-game Tac Map shows the room, and that is the only thing we took from it.
No key room matches that search.
Haneul Nuclear Reactor
Four key rooms around the reactor complex, in grid cells H4 to I5. The DRC locker was already on our map; the maintenance room, the secured bunker and the storehouse were added on 29 October. The three added rooms are area rings: his Tac Map was open near each room, not on its door.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Reactor DRC Locker | H4 | A DRC weapons locker under the water of the collapsed Reactor 02 pool. | Open on the map | TroubleChute Basics, 2:20 |
| Utility Maintenance Storage | H4 | A maintenance room beneath the transformer area next to Reactor 01; the pin marks the area, not the door. | Open on the map | TroubleChute Basics, 2:54 |
| The Chemist's Secure Armory | I4 | A secured bunker by the north-eastern boathouse; the pin marks the area, not the door. | Open on the map | TroubleChute Basics, 1:25 |
| Hazard Storehouse | I5 | A material storage warehouse south of the cooling towers; the pin marks the area, not the door. | Open on the map | TroubleChute Basics, 0:53 |
Cheongun Village and the Heavenly Luck Casino
Three key rooms sit in the casino itself, one above the other: the counting room vault on the main floor, the Vault Armory in the underground parking, and the private lounge upstairs. The rest are the village gun store, the mechanic's shack and the station basement.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Counting Room Vault | F4 | The counting room vault on the main floor of the Heavenly Luck Casino, behind the Cashier shopfront. | Open on the map | TroubleChute Basics, 2:15 |
| Jin Tae's Private Lounge | F4 | The private lounge on the upper floor of the Heavenly Luck Casino; the ring covers the casino. | Open on the map | TroubleChute Basics, 0:16 |
| Vault Armory | F4 | A small armory in the underground parking of the Heavenly Luck Casino. | Open on the map | TroubleChute Basics, 2:18 |
| Gun Store Weapons Locker (Cheongun) | E4 | The basement of the Cheongun gun store: three locked cabinets, and the key opens one. | Open on the map | Community maps |
| Mechanic's Shack | F5 | A locked room in the mechanic's shack just south of the clinic. | Open on the map | TroubleChute Basics, 1:49 |
| Rail Depot Storage | E5 | A storage room in the basement of the railway station near the Cheongun Village fire station. | Open on the map | TroubleChute Basics, 0:22 |
The Grid and NuriGO Mall
The server room, the design complex records room and the bank guard station are in The Grid; the coin mining lab is at NuriGO Mall. The Hanex, Roze and Netshin rooms are close together, so check the map before you commit to a building.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Netshin IT Room | G6 | A high-security server room on the upper floors of the Netshin Tech Complex; a boss is often there. | Open on the map | TroubleChute Basics, 0:26 |
| Hanwoori Arts Records Room | G7 | The art records room on the ground floor of the Hanwoori design complex. | Open on the map | TroubleChute Basics, 0:45 |
| Hanex Guard Station | G6 | The guard station on an upper floor near the Hanex Bank vault. | Open on the map | Our guide |
| Roze's Highrise Armory | G6 | An armory in the Netshin tech area, one or two floors below the roof; the pin is an area. | Open on the map | Our guide |
| Coin Mining Den | G6 | An upper-floor apartment e-coin mining lab just east of the westernmost gas station at NuriGO Mall. | Open on the map | TroubleChute Basics, 0:33 |
| Gun Store Weapons Locker (gun range) | I6 | The basement of the gun range: three locked cabinets, and the key opens one. | Open on the map | Community maps |
Compound Echo, Songdo Wharf and the south-east
Compound Echo's roof and stairwell doors, the barber shop on the wharf, and two basements in the south-east. Several of these keys are reported to spawn in the Compound Echo apartment blocks; our guides say what creators found there.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Gangbyeon Apartment B | G7 | The roof door of Gangbyeon Apartment B in Compound Echo, Hajin River Heights. | Open on the map | Our guide |
| Militia Arms Depot | G7 | A locked stairwell door inside Compound Echo marked Militia Arms Depot. The key's item card, read from IceManIsaac Academy's video, says it opens the armory in Gangbyeon Apartment B; where it drops is still unknown. | Open on the map | Our guide |
| Old Barber Shop | I7 | The Old Barber Shop on the south side of Songdo Wharf, next to the crab shack; first floor. | Open on the map | Our guide |
| Police Station Armory | G7 | The armory in the police station basement. | Open on the map | Community maps |
| Gas Station Electrical Room | H7 | The electrical room in a gas station basement. | Open on the map | Community maps |
Chang-san Air Base
The commandant's office and the bunker door are both under or inside Admin Complex No. 2, so they share a grid cell. The DRC locker sits deeper in the same bunker, and the field depot is the supply warehouse north-east of the clinic.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Commandant Office | B5 | The commandant's office on the second floor of Admin Complex No. 2. | Open on the map | TroubleChute Basics, 0:50 |
| Chang-san bunker access card door | B5 | The access card door to the bunker under Admin Complex No. 2. | Open on the map | Our guide |
| Air Base DRC Weapons Locker | B6 | The DRC weapons locker in the secure armory deep in the bunker; the ring is the whole air base. | Open on the map | Our guide |
| Field Depot | B5 | The gear maintenance room on the first floor of the military supply warehouse north-east of the clinic. | Open on the map | Community maps |
Deadtown and the Re-Education Center
The propaganda store room and the annex are both at the Re-Education Center, close together on our map; the school armory and the black market basement are nearby. The Re-Education Center loot route guide covers how creators reach them.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Re-Education Center Annex | B7 | The annex on the ground floor of the Re-Education Center; the pin is a building area. | Open on the map | Our guide |
| Underground Propaganda Store Room | B7 | The underground propaganda store room beneath the Re-Education Center, in the cells section. | Open on the map | TroubleChute Basics, 0:34 |
| Haksan School Armory | B7 | A locked door on the second floor of the Haksan school, entered from outside the building. | Open on the map | Our guide |
| Blackmarket Weapons Locker (west) | B7 | A basement with two weapon lockers in southern Deadtown; the key opens one. | Open on the map | Our guide |
The Citadel and the north
The Citadel's main control room door takes three keys, and the South Block Armory is reached from inside the complex. The northern black market basement is a separate door with its own key.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| The Citadel (14th Political Prison) | B3 | The main control room door at the Citadel (14th Political Prison); three keys open its doors. | Open on the map | Our guide |
| South Block Armory | B3 | The South Block Armory at the Citadel; the pin is an area. | Open on the map | Our guide |
| Blackmarket Weapons Locker (north) | C2 | A basement with two weapon lockers in the north; the key opens one. | Open on the map | Community maps |
Cheonwang Peak, the radio station and the south
Four key rooms that sit apart from the big areas: Iskra's Control Room at Cheonwang Peak Array, the Haejeok radio station, the Rice Mill bunker and the Hoesik supply room.
| Key room | Grid | Where | Map | Source |
|---|---|---|---|---|
| Iskra's Control Room | E6 | Iskra's Control Room, the key room at Cheonwang Peak Array; the pin is an area. | Open on the map | Our guide |
| Haejeok Radio Station | D6 | The locked room at Haejeok Radio Station. | Open on the map | Community maps |
| Rice Mill Bunker | D8 | The bunker door at the Rice Mill, Imjin Farmland. | Open on the map | Community maps |
| Hoesik Supply Room | D8 | The Hoesik supply room, a warehouse. | Open on the map | Community maps |
How we placed the pins
The grid cell is the Tac Map's own letter and number. Where a key card or a creator's video title gives one, we use it; for the rest we work it out from the pin's position on our map, so a pin close to the edge of a cell can be one cell out. For the fourteen TroubleChute Basics videos we used one thing: the moment his in-game Tac Map is open on the key room. We matched that frame's landmarks to our Official skin of the Hajin map and put our pin at the matching point; the fit error was under 2 px on our 4096 px map. His player marker shows where he stood when he opened the map, so for a couple of rooms it sits up to about 110 px from the door; where we already had a pin we kept it. We did not copy his footage, his words, his loot lists or his routes. Every line on this page and in the map pop-ups is our own. None of these positions have been tested by us in a raid.
Hajin map: 13 POIs → Bank vaults and safe loot run → Solo compound to train loot route →
Questions people ask
Quick answers about the MW4 DMZ key rooms on Hajin.
Where are all the keys in MW4 DMZ?
This page lists every key room and door on our Hajin map, 36 in all, with grid cell, location and source. Where the key itself comes from is a separate question: our map's key sources layer marks the spots creators have reported, and the guides linked in the Source column say what they found.
What do the grid letters and numbers mean?
They are the Tac Map's own grid, a letter for the column and a number for the row, for example F4 for the Heavenly Luck Casino. The in-game key card for some keys prints its cell.
Why are some pins rings instead of points?
A dashed ring means area only: we know the building or the floor but not the exact door. The map says so in the pop-up.
Do the key spawn spots change?
Creators we cite report that several do, from raid to raid. We have not tested any of them, so the key sources layer shows what was seen, not a guarantee.
Source briefing
Room names and grid cells for fourteen keys come from TroubleChute Basics' key location videos on YouTube (channel: https://www.youtube.com/@TroubleChuteBasics). We took only where each room is, and we link each one in the Source column at the second where his Tac Map shows it. The other rooms come from the CODMunity and DMZHub community maps, cross-checked by us, and from the creators credited in our own guides, which the Source column links. All prose is our own and no creator footage is reproduced here. Please watch the videos and visit the channels. Our Hajin map, the routes on it and the Squad Share map room are live on this site. DMZ support in the Wing Mait app is in development.
TroubleChute Basics on YouTube → Open the Hajin map with the keys layer → Hajin map: 13 POIs →
Related field notes
MW4 DMZ29 Oct 2026MW4 DMZ patch notes, 28 October 2026What the 28 October 2026 MW4 update changed in DMZ: the Possum rework, loadout and backpack fixes, closed exploits, and which of our guides and routes it touches.FIELD NOTE 10
MW4 DMZ27 Oct 2026Loot routes: every route on one mapEvery MW4 DMZ loot route on the site in one comparison table, B Man's new compound belt route written up in full, where creators disagree, and all of it on our Hajin map.FIELD NOTE 11
MW4 DMZ27 Oct 2026Re-Education Center loot routeIceManIsaac's Deadtown run through the Re-Education Center: the propaganda store room, the annex, a black market and a helicopter out, with every key and stop pinned on our Hajin map.Sources
Numbers and mechanics on this page are paraphrased from:
Wing Mait is an independent project, not affiliated with or endorsed by Activision. Wing Mait for MW4 DMZ is in development and has not been released.