REX Hangar & The PAL Key

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Guide Progress

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1. The Underground Metal Gear REX Hangar
Unlocking the heavy armored blast door with the Level 7 Keycard brings you into the Metal Gear REX Test Hangar:
Mecha Gantry Platforms
- Gun Cameras: Lob Chaff Grenades to blind the automated surveillance gun turrets covering the upper catwalks.
- Stinger Missile Cache: Along the right-hand catwalk, recover 15 Stinger Missiles, critical for the impending final battles.
Climb the gantry stairs to the upper platform overlooking REX's head. Use your Binoculars to overhear Liquid Snake and Revolver Ocelot inside the control room plotting world military domination.

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2. Retrieving the Dropped PAL Key
Attempting to enter the control room prompts Ocelot to fire a precision shot, knocking the PAL Key out of Snake's hands and down into the drainage sump below:
- Sprint down the gantry ladders to the ground-floor pool.
- Equip Thermal Goggles to locate the shimmering yellow signature of the key submerged in the wastewater.
- Beware of aquatic proximity mines and deceptive decoy items.
- Retrieve the PAL Key and return to the upper control room.

3. The Shape-Memory Thermal PAL Key Puzzle

The PAL Key is composed of a shape-memory alloy that alters its physical card layout according to temperature. You must input the key into all three terminals, in this exact order:

Thermal Override Sequence

Puzzle Reference

	Slot	Reading
1	Yellow — Center Slot	Room temperature, no detour needed: insert the PAL Key as soon as you have it.
2	Blue — Left Slot	Backtrack to the frozen warehouse where you fought Vulcan Raven and stand in the snow until the card icon turns Blue, then run back and insert.
3	Red — Right Slot	Backtrack to the Blast Furnace boiler room and stand beside the molten metal vats until the card turns Red, then sprint straight back — lingering in cold sectors normalizes it again — and insert.

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4. The Deception Revealed & Gas Lockout
Inserting the third key triggers a chilling automated broadcast: "Nuclear launch override confirmed. Metal Gear REX armed and ready!".
- The Codec chimes: Master Miller reveals the real Miller was murdered days ago in his home... you have been speaking with Liquid Snake in disguise all along. Snake was tricked into activating REX.
- Blast doors slam shut, locking Snake inside as lethal nerve gas floods the chamber.
- Equip the Gas Mask immediately to slow vitality drain.
- Radio Otacon (141.12) urgently on the Codec to hack the facility controls and override the emergency security door.
  
  Rapid Evacuation
  The instant Otacon cracks the door lock, dash out into the main hangar to confront Liquid Snake face to face.

1. The Underground Metal Gear REX Hangar

2. Retrieving the Dropped PAL Key

3. The Shape-Memory Thermal PAL Key Puzzle

4. The Deception Revealed & Gas Lockout

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