Deep Vault 301 is a Legendary keycard in MW4 DMZ for X01, the Season 1 black site. It does two things. It opens the X01 Deep Vault gate without being used up, and it unlocks Room 301, a red bio lab on the third level of the Deep Vault, under grid C2 of the Data Center floor. Below is where the door is, how to get the card, the route down and what we found inside in our two openings.
- Room 301 is on the third level of the X01 Deep Vault, under the northwest end of the Deep Vault wing (C2). Go through the round Deep Vault gate, ride the elevator down, take the stairwell down to level 3 and follow the railing past 303 and 302.
- The keycard opens the Deep Vault gate without being used up. Room 301 does use it up, both times we opened it.
- It is field loot and keycards roll randomly. We brought ours in, and on an earlier run one came off an enemy at the foot of the Medical Wing stairs.
- We opened it twice and found the same 5 containers each time, with at least $9,600 to $25,350 in loot and no Legendary item. The best find was an Epic Ceramic Pup of Loyalty ($6,000) lying loose in the room, ahead of a Stim recipe and a weapon manual worth $5,000 each.
- On its own it is not really worth it for a Legendary card. Bring several Deep Vault keycards, because 301, 302 and 303 sit side by side on the third level.
Where the Room 301 Door Is
The Deep Vault is the long wing in the northwest of the X01 Data Center floor, running from grid D3 up to C2 on the tac map. Its entrance is the big round vault door at the southeast end, the Deep Vault gate. Room 301 is not on that floor. It is two levels further down, but on the tac map it sits under the northwest end of the wing, grid C2, which is also the grid on the keycard tooltip.
On the third level a corridor runs along a railing with three keycard rooms in a row, 303, 302 and 301. Room 301 is the last of the three. The card reader is on the wall by the door and the number 301 is painted next to it. The door is also on our interactive MW4 DMZ map under the X01 keys layer.
Click to enlarge The Room 301 door with the 301 sign on the wall, right as it unlocked (brightened). 
How to Get the Deep Vault 301 Keycard
Deep Vault 301 is field loot, and keycards roll randomly, so there is no fixed spot to farm it. We brought ours into X01 in a secure slot. On an earlier run one came off an enemy at the foot of the Medical Wing stairs in X01. The game labels it a key in the tooltip, worth $100.
Each Deep Vault keycard works the same way. It opens the Deep Vault gate and its own room further down. The Deep Vault 406 keycard we found on the desk in the X01 Executive Room opens Room 406, for example, and Deep Vault 106 opens Room 106 on the lab level, one level above Room 301. The gate does not use the card up. Room 301 does, both times we opened it. Our card was still in the secure slot after we went through the gate and was gone right after Room 301 unlocked.
To get into X01 you can pick it straight from the FOB deploy menu, as its own location with Free Roam, and you spawn inside the facility. Our X01 entrance guide covers the ways in, and every key on Hajin is in our MW4 DMZ keys guide.
The Route to the Door
- The Deep Vault gate. On the Data Center floor, follow the wide corridor from the Logistics Tunnel northwest past the Deep Vault sign into the wing. The gate is a big round vault door at the back of a hall with crates. Ours was already open when we got there. A Deep Vault keycard opens it and stays in your inventory.
- The elevator down. Past the gate is a room with an elevator. Press the red call button and step in behind the square vault door in front of the car. The elevator takes you down to a level with lab rooms numbered 101 to 106 (103 was locked in our run). Wall turrets with red laser sights watch this corridor and shoot at you. Take them out before you move on.
- Room 301 along the railing. Take the stairwell down past the big painted 2 to level 3. Follow the corridor along the railing past 303 and 302. Room 301 is the last door. Swipe the keycard at the card reader on the wall.
Click to enlarge The Deep Vault gate, already open when we got there (brightened). 
The Deep Vault goes on past these rooms. The Core Room and Blix, the target the X01 orders send you to kill inside the Deep Vault, are further in. This page sticks to Room 301.
What Is Inside Room 301
Behind the door is a red-lit bio lab with animal cages along the walls and a body on an operating table in the middle. We opened it twice and found the same 5 containers both times. There are two weapons lockers, a footlocker, a supply crate and the body on the table, which you can search like a container.
Containers
- 2× Weapons Locker
- 1× Corpse
- 1× Footlocker
- 1× Supply Crate
The containers decide the loot. Tap one to see what it can drop in our loot data.
Best finds in our runs
-
Ceramic Pup of Loyalty Epic$6,000 -
Stim Recipe Rare$5,000 -
Manual: Rezi 12 $5,000 -
Patriot XMR Epic$3,500 -
Animal Trial Records: R-4 Rare$3,000 -
Sang 9mm Epic$500
Loot per run
- Animal Trial Records: R-4 Rare $3,000 Weapons Locker
-
HAN 86 Rare $1,600 Weapons Locker -
2-Plate Armor Vest ×2 Rare $1,000 each Footlocker, Supply Crate -
Regional Combat Notes Uncommon $1,000 Supply Crate - Sang 9mm Epic $500 Weapons Locker
-
Recon Drone Rare $300 Supply Crate -
Control Unit ×2 Uncommon $200 each Weapons Locker -
Detonators ×2 Uncommon $200 each Weapons Locker -
Bandage Uncommon $100 Supply Crate -
Stim Uncommon $100 Footlocker -
Molotov Cocktail Common $50 Corpse -
Screamer Mine Common $50 Weapons Locker -
Smoke Grenade Common $50 Supply Crate -
Thermite Common $50 Weapons Locker -
Armor Plate ×2 Footlocker -
Synthetics ×24 Footlocker, Corpse
- Ceramic Pup of Loyalty Epic $6,000 Loose in the room
- Stim Recipe Rare $5,000 Corpse
- Manual: Rezi 12 $5,000 Weapons Locker
- Patriot XMR Epic $3,500 Weapons Locker
-
Kastov 762 Rare $1,500 Weapons Locker - 2-Plate Armor Vest Rare $1,000 Footlocker
-
Medium Backpack Rare $1,000 Weapons Locker -
Weak Night Vision Goggles Uncommon $1,000 Weapons Locker -
MAR-9 Common $400 Supply Crate - Control Unit Uncommon $200 Weapons Locker
-
Reactive Metals Uncommon $200 Weapons Locker - Bandage Uncommon $100 Supply Crate
-
Drill Charge Uncommon $100 Supply Crate -
Portable Radar Uncommon $100 Weapons Locker - Stim Uncommon $100 Supply Crate
- Molotov Cocktail Common $50 Corpse
-
Semtex Common $50 Weapons Locker -
Shock Stick Common $50 Weapons Locker - Armor Plate Common Footlocker
-
Stun Grenade Common Weapons Locker -
Metals ×3 Corpse - Synthetics ×10 Corpse
Plus 2 items we could not identify.
From 2 openings in our own runs. The best finds cover all of them, and the run buttons show what one opening held. Loot is random, so your room can roll differently, and we add every new run of this key. Values are per item, from the in-game tooltips. The loot value adds up every item with a known value and the cash, so it is a lower bound: crafting resources and items without a value are not in it.
The weapons lockers hold most of the value. One of them had an Epic weapon each time, a Sang 9mm pistol once and a Patriot XMR assault rifle worth $3,500 the other time. Between them they also gave a weapon manual worth $5,000, an Animal Trial Records: R-4 worth $3,000, a Rare HAN 86 and Kastov 762, Weak Night Vision Goggles, a Medium Backpack, Control Units and Detonators. The body on the table had a Molotov Cocktail and Synthetics both times, and once a Stim recipe worth $5,000. The footlocker held a 2-Plate Armor Vest and armor plates, and the supply crate gave small items such as a Bandage, a Stim, a Recon Drone, a Drill Charge, an Uncommon valuable and a MAR-9 marksman rifle. Once an Epic Ceramic Pup of Loyalty worth $6,000 also lay loose in the room, the best single find in our openings. Together that came to at least $9,600 to $25,350 in loot per opening, with no Legendary item.
Click to enlarge The bio lab behind the door, with the body on the operating table (brightened). 
Click to enlarge The first weapons locker with the Animal Trial Records: R-4 (brightened). 
Is the Deep Vault 301 Keycard Worth It?
On its own, not really. For a Legendary card the loot is weak and the room has very few containers. Room 301 also sits in a chaotic part of the Deep Vault, with turrets shooting at you on the way down.
It does become worth it when you bring several Deep Vault keycards. The third level has keycard rooms next to each other, 301, 302 and 303, so you can open them one after another in a single trip, and the gate only needs one card that you keep. That is where it gets interesting.
Our other X01 keycard pages cover the Executive Room, the Audit Room, the Small Test Chamber, the Maintenance Room, Deep Vault 106, Deep Vault 406, the Superintendent’s Office and Lt. Chol-Min’s Stash Room, each with its route and loot.
Frequently Asked Questions
Where is Room 301 in the MW4 DMZ Deep Vault?
On the third level of the X01 Deep Vault, under the northwest end of the Deep Vault wing, grid C2 on the Data Center floor. Go through the round Deep Vault gate, take the elevator behind it down, then take the stairwell down to level 3. Follow the corridor along the railing past rooms 303 and 302. Room 301 is the last door, with the card reader on the wall and the number 301 next to it.
How do you get the Deep Vault 301 keycard?
It is field loot, and keycards roll randomly. We brought ours into X01 in a secure slot. On an earlier run one came off an enemy at the foot of the Medical Wing stairs in X01.
Is the Deep Vault 301 keycard used up?
Not at the gate. The card opens the X01 Deep Vault gate and stays in your inventory. Room 301 does use it up. Our card was still in the secure slot after we passed the gate and was gone right after the Room 301 door unlocked, and the second time we opened the room it was gone as well.
Is the Deep Vault 301 keycard worth it?
On its own, not really for a Legendary card. Room 301 has only 5 containers and the loot is weak for a yellow card, with at least $9,600 to $25,350 in our two openings and no Legendary item. The best find was an Epic Ceramic Pup of Loyalty ($6,000) lying loose in the room, ahead of a Stim recipe and a weapon manual worth $5,000 each. The way down also runs past turrets that shoot at you. It does become worth it when you bring several Deep Vault keycards, because rooms 301, 302 and 303 sit next to each other on the third level and you can open them one after another in a single trip.
