More:Halo 2: Missions: Cairo Station

From GameWinners

Contents 1 Thunderstorm Skull 2 Secret message 3 Plasma Pistols

Thunderstorm Skull

 Xbox  Play the level under the legendary difficulty setting. Play through the level until you reach the second room where the Covenant are boarding. The game will say "Priority Shift". Go through the Armory and take out the Elites. Then, go to the "Commons B.01" and clear out all enemies on the ground floor and the Grunts on the far side manning the plasma turrets. Once the room is clear, look into space. You should see the dual tram tracks. Note that the supports in the center are close together. One of those diagonal supports goes down the side of the wall where the glass railing is locaed. Jump on the post for the glass railing and jump onto the diagonal support. From there, jump onto the tram track and follow it all the way down towards the door you originally came in. You should see a landing with a trash can. The skull is in this trash can. Walk up to the trash can and hold X to pick up this skull. The word "Thunderstorm" will appear. This skull causes all Covenant enemies to be Spec Ops.

Secret message

Before attempting to perform this, make sure that the Sputnik Skull is in effect. Make your way through the level until you reach to the section entitled "Authorized Personnel Only." Continue forward until you see a slanted pillar(it will not be far from the opening of the air lock). Jump on the ramp and walk up to the top of the pillar. You should be on a ledge. Grenade jump on top of the wall. A little to the left you should see a Covenant ship. This means that you are in the correct location. Continue left on the top of the wall until you are above three slanted pillars. Just past the third pillar, fall down onto a circular platform to the left. Continue walking across the two glass floors until you reach a platform. Jump on the platform, duck down, and turn on your flashlight. You should see the engraved words "IN AMYS SHAD".
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Plasma Pistols

Plasma Pistols can be your best friend on Cairo Station. Grunts carry these and drop them quite frequently. When charged, it takes out almost any shield. Combined with a Battle Rifle, you can tear through the boarding parties and continue to Earth. This works on almost all levels, but Battle Rifles become less frequent the further you are in the game.