- Nuclear Warhead Storage Building

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Metal Gear Solid 4 Guide - Act 4: Twin Suns

Nuclear Warhead Storage Building

First Floor

Turn off your Night Vision and go down the slope, crawling under the door. There are no enemies in this area so feel free to explore for items. Otacon will call you and let you know that we should be able to get through using the door at the back, to the direct north. He'll call you again however, informing you that it is locked once you get close. We now need to head up to Otacon's office. Go back and up the nearest set of stairs, following the walkway to reach the elevator. Press Triangle by the panel to call the lift.

The elevator to take you to floor B2

Once inside, move to the panel by the door, press Triangle and select floor B2.

Floor B2

Go straight on and down to the end of the corridor, turning left at the bottom. Take the next left and follow this corridor all the way to trigger a cutscene.

(Cut Scene 4, Length 07:12)

There are a variety of possible codes to enter here, though only one is the correct one, the others unlock secrets. The full list is in the secrets section of this guide. If you just want the basic one, the code is 42873. You lose Physche if you get it wrong and there are two possible endings to the cutscene depending on whether it's right or wrong.

Collect the Ration on the floor just to your right as you start following the cutscene. Go back out the way you came in but beware! Once you enter the main corridor a Gekko (where it came from who knows?) will enter the building, and you'll have to be intelligent to get past him. You can cloak the Mk. III and send it underneath the desk in the doorway at the west of the main corridor that the Gekko is patrolling, and then follow the path through to the flashing panel in the room to the left of the lift to electrify the floor (a context sensitive Triangle command will come up). You could use a Chaff grenade on the Gekko but bear in mind that you have to call the lift which takes time and it may well have recovered. You could try to destroy the Gekko manually, but this is obviously notoriously hard – enough rockets will do it though.. The easiest option is to use the Mk. III. You could also use the Solid Eye to locate the Gekko and crawl underneath the desk yourself. If you get spotted you won't be able to call the lift until peace is restored.

The electric-floor panel by the lift

The Gekko can't get through many of the doorways, so just fall back and recompose yourself if you get spotted. Once in the lift select Floor 1.

First Floor

Head back down the steps to the previously locked door.

(Cut Scene 5, Length 00:35)

A Gekko is now in the room with you and you need to draw its attention away from the Mk. III. Again, there are many ways of doing this, including destroying the Gekko itself. You could lay some mines in the area around the Mk. III before the Gekko spots it, then allow it to get close and deal some serious damage to it. The easiest way is to head to the collection of crates and missiles towards the southern end of the hangar. Get up against some of the crates and shoot at the Gekko. Do this every time the Gekko loses interest in you and starts on the Mk. III. Then, as it begins to chase you, just run around the crates and missiles (you should be faster than the Gekko) keeping it just out of your line of sight and hide once you get a chance.

Play cat and mouse with the Gekko to keep it busy

This buys you time as it searches before you can draw its attention again as it makes for the Mk. III. Use Chaff Grenades if you have any left to buy yourself another slice of time and an opportunity to hide if necessary, though they are at a premium and not to be wasted.

Keep an eye on the progress bar and try to stay hidden as it nears the end or the Gekko will get to you during the next cutscene.

How to keep the Gekko busy

(Cut Scene 6, Length 00:05)

Head through the door once it's open. Don’t worry about getting spotted as you can just keep running through to trigger the next section.