The Deep Vault in X01 contains plenty of locked rooms to open, but you're going to need to know how to get their specific keys.
The Deep Vault contains some of the rarest loot in X01, but to open it, you're going to need one of three keycards. These keycards each have their own loot rooms within the Deep Vault itself, so we've listed their locations below so you know where to get them and what rooms they open. We've also provided a useful map below so you won't get lost while exploring the dangers of X01.
The Deep Vault in X01 has some of the best loot you can get in MW4 DMZ. Here's what you need to do to open it.
Defeat Lieutenant Tyune, who spawns at the Data Center, and he has a rare chance to drop the Vault 106 Card.
Defeat the Captain (Commander), and he has a rare chance to drop the Vault 301 Card.
Get the Encodable Blank Keycard and use the Supply Depot Keycard Encoder Station to make the Executive Access Card.
Open the Executive Room in the Admin Offices to find the Vault 406 card.
You can also loot the Core Room in the Vault, but this first requires you to open up the loot room specific to your Vault Card.
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