The Supreme Leader’s Bunker Access Card is a valuable key item in Call of Duty: Modern Warfare 4 DMZ. It opens a hidden bunker beneath Chang-san Air Base, where players can search for Legendary weapons and other useful loot. However, reaching the bunker is not easy. The area has an Extreme threat rating, and other squads may also be looking for its rewards.
If you have obtained the card but cannot find the correct door, here is how to reach the bunker, use the access card, and collect the loot before extracting safely.
How to Get the Supreme Leader’s Bunker Access Card
You can obtain the Supreme Leader’s Bunker Access Card by completing the Operation Iron Citadel story mission. This mission takes place around Chang-san Air Base and rewards you with the card after you finish its objectives.
You do not need to search random containers for a guaranteed card spawn. Completing the mission is the reported way to earn this item.
Before starting another deployment, prepare your equipment carefully. The card is single-use, meaning it opens the bunker once before being consumed.
To protect it, place the card in a Secure Slot if your available backpack supports one. This helps prevent you from losing the item if your deployment ends badly.
Where to Find the Supreme Leader’s Bunker
The bunker is located deep beneath Chang-san Air Base on the Hajin map. Its approximate location is grid B6, within the underground facility.
The base is a dangerous place to explore. Prepare for hostile artificial intelligence enemies and possible encounters with other players.
Bring the following equipment before heading there:
- A reliable weapon with enough ammunition for extended fights.
- Armor and healing supplies.
- A backpack with enough space for valuable loot.
- The Supreme Leader’s Bunker Access Card.
- A planned extraction route.
Once you are ready, deploy into the area and make your way toward the southeastern entrance of Chang-san Air Base.
How to Use the Access Card
Follow these steps to reach the locked bunker doors.
Step 1: Enter the Air Base
Look for the entrance marked ENTRANCE on the southeastern side of Chang-san Air Base. Enter the facility and turn right.
Step 2: Find Door 01
Look for a large doorway marked with the number 01. A button beside the doorway controls its shutters. Interact with the button to raise them and open the passage.
Step 3: Follow the Underground Corridor
Move through the opening and look for the corridor with Korean lettering above its entrance. Follow the passage and take the first right turn.
Step 4: Descend the Stairs
Continue down the staircase until you reach the lower underground section. You should eventually find a pair of large white blast doors with red star symbols.
Step 5: Activate the Card Reader
Look for the access card reader on the brick wall to the right of the blast doors. Approach it and interact with the prompt to use your Supreme Leader’s Bunker Access Card.
The doors should open, allowing you to enter the bunker and search for its rewards.
What Loot Can You Find Inside the Bunker?
The bunker contains several valuable items, making the trip worthwhile if you can extract safely.
The main reward is a chest inside the bedroom to the right of the wall-mounted map. Once inside the bedroom, check the left side of the room for the chest. Reports indicate that it contains a guaranteed Legendary weapon alongside randomized loot.
You should also search the surrounding rooms for:
- Weapon lockers containing additional equipment.
- Valuable items that can be sold or used.
- Other loot containers that may provide useful supplies.
Check your backpack capacity before collecting everything. Prioritize the weapons and items that offer the greatest value for your next deployment.
Tips for Surviving the Bunker Run
Chang-san Air Base is dangerous, so opening the bunker is only half the challenge. You must also escape with your rewards.
Keep these tips in mind:
- Secure the card: Protect it in a Secure Slot when possible.
- Avoid unnecessary fights: Engage enemies only when they block your route or threaten your squad.
- Know your exit: Plan an extraction route before entering the bunker.
- Loot quickly: Search the important rooms without spending too long underground.
- Watch for other squads: Other players may be waiting for the same rewards.
If you lose the card before using it, you may need to complete Operation Iron Citadel again to earn another one. This makes preparation especially important.
