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Fallout: New Vegas Hints
Search the vaults in the region for a differential pressure controller.
1 of 7: This component can be found in Vault 11 (location 37 on the Zone 2 Map).
2 of 7: Kill off the scorpions and mantises in the entry room, then go through its back door and turn right.
3 of 7: Watch for more vermin as you make your way north to the door that leads to the Vault 11 Living Quarters area.
4 of 7: Go south to the center of the living quarters, then go across to its other side so you can go north and find the Vault 11 Lower Level door.
5 of 7: In the lower level, go north until you have to turn right, then take the corridor that leads south.
6 of 7: After it turns east, take the next south corridor to its end and enter the radioactive water.
7 of 7: Go through the first underwater door you come to and surface for air, then loot the underwater locker to get the differential pressure controller.