Cairo Station

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Cairo Station is the third level in Halo 2 taking place in Earth's orbit on the Cairo Station. The Master Chief and UNSC Marines fight against boarding Covenant troops culminating in a battle over a Elite-guarded bomb intended to destroy the station. This is the first level in which enemies are encountered.

Transcript
{Cutscene}

The Master Chief and Sgt. Mjr. Avery Johnson step from the tram into a crowd of cheering Marines, robot cameras hover around.


 * Master Chief: "You told me there wouldn't be any cameras."


 * Sergeant Major Johnson: "And you told me you were gonna wear something nice! Folks need heroes, Chief. To give 'em hope. (raises cap, adjusts his hair, puts cap back on) So smile, would ya? While we still got something to smile about!"

Johnson and the Master Chief walk to the end of the room, as the Bridge's blast doors open up.

The view changes to High Charity, where Tartarus and two of his Brutes walk the Elite Commander, Thel 'Vadamee, out onto a ledge on High Charity''. Honor Guard Elites are stationed on either side. Covenant Grunts, Jackals and Hunters have gathered on the walkway.''


 * Grunts: "He-re-tic! He-re-tic!"

They reach the ledge, in which we see the stadium seats filled with roaring Covenant aliens, and the Brutes fix the Commander's arms onto floating cuffs.


 * Tartarus:(gleefully) "You've drawn quite a crowd."


 * Thel 'Vadamee: (bitterly) "If they've come to hear me beg, they will be disappointed."


 * Tartarus: (malevolently) "Are you sure?"

The entire crowd cheers as energy beams hit 'Vadamee on either side, and he shakes with pain.

The view changes back to the Cairo's bridge, dozens of Naval officers cheer as Master Chief and Sergeant Johnson approach Lord Hood at the end. Master Chief and Johnson salute to Lord Hood.


 * Lord Hood: "Gentlemen, we're lucky to have you back."

An officer whispers in Lord Hood's ear.


 * Lord Hood: "Go ahead, Cortana."

Cortana's avatar appears on a nearby holotank.


 * Cortana: "Another whisper, sir, near Io. We have probes en route."

Hood looks back to the Chief and Johnson.


 * Lord Hood: "I apologize, but we're going to have to make this quick."

Lord Hood turns away.

Cortana looks up at the Chief and Johnson.


 * Cortana: "You look nice."

Johnson and the Chief respond simultaneously.
 * Master Chief: "Thanks."
 * Sergeant Johnson: "Thank you."

The Master Chief and Johnson look at each other.

Lord Hood picks up a Colonial Cross medal from a red-clothed case containing two other Colonial Cross medals.


 * Lord Hood: "Sergeant Major, The Colonial Cross is awarded for acts of singular daring and devotion, for a soldier of the United Earth Space Corps..."

Hood pins the medal on Johnson's uniform.

The view changes back to High Charity, on Tartarus' face.


 * Tartarus: "...There can be no greater heresy! Let him be an example for all who would break our Covenant!"

''The Covenant crowd cheers once more. Tartarus barks an order, and two Brutes grab onto 'Vadamee's now charred armor and pull.''

The view once again changes back to Cairo Station, as a young woman joins the Chief and Johnson.


 * Lord Hood: "Commander Miranda Keyes. Your father's actions were in keeping with the highest traditions of military service. His bravery in the face of impossible odds reflects great credit, upon himself, and the UNSC. The Navy has lost one of its best."

Hood hands her the Colonial Cross medal.

The view changes back to High Charity'' again, where a blackened Sangheili Combat helmet falls to the floor, and the naked 'Vadamee hangs limply from his restraints. A glowing brand rises from the floor behind him, and Tartarus grabs it and strides forward.''

''Thel 'Vadamee raises his head weakly. Tartarus gives him a fierce look, and presses the brand against the Elite's chest with glee. The tortured Elite fights the pain but gives in and screams.''

The view once more changes to Cairo Station, where alarms start to sound.


 * Cortana: "Slipspace ruptures directly off our battle cluster."


 * Lord Hood: "Show me."

Images of Covenant ships appears on a large screen.


 * Cortana: "Fifteen Covenant capital ships holding position just outside the kill zone."

The screen shows UNSC ships approaching the Covenant fleet.


 * Fleet Admiral Harper (COM): "This is Fleet Admiral Harper. We are engaging the enemy."


 * Lord Hood: "Negative, Admiral. Form a defensive perimeter around the cluster." (to Miranda Keyes) "Commander, get to your ship, link up with the fleet."

Keyes salutes.


 * Commander Keyes: "Yes, sir." (leaves)


 * Lord Hood: "You have the MAC gun, Cortana. As soon as they come in range, open up."


 * Cortana: "Gladly."

Cortana's avatar disappears.


 * Lord Hood: (Concerned) "Something's not right... The fleet that destroyed Reach was fifty times this size."

An Officer faces Lord Hood.


 * Officer: (Panicked) "Sir, additional contacts. Boarding crafts, and lots of 'em!"

The view shifts back to the screen.


 * Lord Hood: "They're going to try to take our MAC guns offline, give their capital ships a straight shot at Earth. (Looks to the Chief) Master Chief, defend this station!"


 * Master Chief: "Yes, sir." (to Johnson) "I need a weapon."


 * Sergeant Johnson: "Right this way."

''Johnson and the Master Chief leave the bridge, as Lord Hood turns back to his command station. Through the bay windows looking up to the MAC cannon, the fleet turns to engage the Covenant attackers. Longsword fighters hurtle overhead trailed by Marathon-class Cruisers.''

{Gameplay}


 * Cairo Defence Coordinator (Loudspeaker): "Alert! Boarders inbound!"

''The Master Chief arms himself and joins Johnson and a squad of Marines. Miranda Keyes and several Navy officers leave on a tram.''


 * Cairo Defence Coordinator (Loudspeaker): "All hands report to battle stations. This is not a drill. I repeat, this is not a drill!"

The Chief, Johnson, and the Marines enter the Recreation area


 * Sergeant Johnson (COM): "How's it going, Malta?"


 * Malta Defence Coordinator (COM): "Stand-by... they're latched! Check your targets and watch the crossfires."


 * Malta Defence Coordinator (COM): "They're in standard formation: little bastards up front, big ones in back... Good luck, Cairo."

''Outside, a Covenant Boarding Craft latches onto the hull, causing the station to shake. Weapons fire is soon heard from outside the doorway.''


 * Sergeant Johnson: "I need a Field of fire on that bulkhead. As soon as that door opens, let 'em have it!"

''The Marines take up position around a sealed bulkhead. Johnson sets up a stationary gun turret. A bright light and crackling noise, like a welding torch, comes from the center of the door, and is soon followed by an explosion. The door is blasted open and Covenant intruders appear. With the Master Chief's help, the UNSC defenders eliminate the attackers.''

Home Field Advantage

 * Lord Hood (COM): "Find the boarders' point of entry, Chief. Cut them off at the source."

If the player stalls:


 * Lord Hood (COM): "Chief, if we don't take out their boarding craft, they'll just keep sending reinforcements."

If the player stalls some more:


 * Lord Hood (COM): "Concentrate on the boarding craft, Chief. The Marines can handle the rest."

The Master Chief heads off to find the boarding craft, while the Marines stay behind to guard the entrance to the Recreation room.


 * Female Marine: "This'll be our fallback position, sir."

Or


 * Marine: "We've got orders to stay here, Chief."

Or


 * Marine: "This is as far as we go, Chief."


 * Cairo Defence Coordinator (Loudspeaker): "This is not a drill. I repeat, this is not a drill."

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Boarders in Habitat Alpha."

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Brace for impact!"

A loud clang is heard as a Boarding Craft attaches to Cairo station

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "I need a squad in Habitat Alpha, ASAP!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Quick response teams to Security Station 3!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Seal pressure doors."

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Attention! Boarders in Section 7!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "We've got boarders in the port Pelican bay!"

Once the Master Chief finishes killing all Covenant boarders in the first Hangar bay, Covenant Boarding Crafts are seen through the windows rapidly leaving Malta Station.


 * Private First Class Chips Dubbo: "Hey, check it out! The Malta ' s already driven off its boarders!"


 * Cortana (COM): "Malta, what's your status, over?"


 * Malta Defence Coordinator (COM): "I don't believe it! They're retreating, we won!"

Malta Station suddenly explodes in a huge ball of fire, the barrel of the MAC gun breaking loose and tumbling away.


 * Private Dubbo: "This is bad! Real bad!"


 * Cairo Defence Coordinator (Loudspeaker): "All hands, brace for impact!"

The Hangar bay is soon attacked by a new wave of Covenant from another Hangar bay.

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Alert! Hostiles have breached the Port MAC bay!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Security Station 4 is under attack."

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Fireteams, boarders in Section 2."

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Attention! We have boarders in Section 3!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Alert! Boarders have breached the Communications deck!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Attention! We have hostiles on the Command deck!"

Once Master Chief finishes killing all the intruders in the second Hangar bay, Covenant Boarding Crafts are seen through the windows retreating, only this time, from Athens Station.


 * Private Dubbo: "Uh oh! Hey, they're leaving the Athens!"

The Athens explodes violently, just like the Malta.


 * Lord Hood (COM): "Cortana, assessment!"


 * Cortana (COM): "That explosion came from inside the Athens. Same as the Malta. The Covenant must have brought something with them. A bomb."


 * Lord Hood (COM): "Then they sure as hell brought one here. Chief, find it."

Priority Shift
If the player decides to stall for awhile, Cortana will remind them of the urgency of the situation with some of the following lines:


 * Cortana: "Chief, we don't have much time."


 * Cortana: "Not a lot of time on the clock, Chief!"


 * Cortana: "Where are you?! The bomb is right here!"


 * Cortana: "The clock's tickin' Chief, get down here!"


 * Cortana: "Chief, over here, next to the bomb!"


 * Cortana: "Ask yourself this question right now: Is doing what I am right now helping Cortana stop this station from blowing into tiny, tiny bits?"


 * Cortana: "Just a friendly reminder: Bomb."


 * Cortana: "If this thing goes off, I am NEVER talking to you again!"

The Chief takes a route under the Hangar bay, and encounters another group of Covenant.


 * Cairo Defense Coordinator (Loudspeaker): "All non-combat personnel to pressure zones."

''As the Chief returns to the armory, he finds the Master Gunnery Sergeant fighting a pair of Elites, armed with a Shotgun. Exactly what he says to them differs depending on what the difficulty level is set to.''


 * Master Gunnery Sergeant (Easy or Normal): "Get the hell out of my armory, split-lip! Oh God—!"


 * Master Gunnery Sergeant (Heroic): "Tell your friends I got enough ammo for all of 'ya!"


 * Master Gunnery Sergeant (Legendary): "Come on, is that a weapon or a flashlight? Oh, dangit—!"

''The Master Gunnery Sergeant is hit by bolts of plasma and dies. The Chief proceeds upstairs and eliminates the Elites.''


 * Cairo Defence Coordinator (Loudspeaker): "Fireteams to Habitat Delta."

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Hang on, everyone!"

Another vibration occurs, as another Boarding Craft is attached.

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "Hostiles have taken Security Station 1!"

(Later)


 * Cairo Defence Coordinator (Loudspeaker): "I need a squad in Habitat Delta!"

The Chief comes to a hallway where Keyes, Johnson, and a couple of officers are engaged in a firefight outside the gangway to the In Amber Clad.


 * Sergeant Johnson: "Come on, Chief, this way!"


 * Commander Keyes: "I was almost on board when they showed up."


 * Sergeant Johnson: "Don't worry, ma'am, we're on it."

Once they clear the area:


 * Commander Keyes: "Thanks, Chief. I owe you one."


 * Sergeant Johnson: "Get going. I'll cover the Commander."


 * Cairo Defence Coordinator (Loudspeaker): "Fireteams to Terminal 2."

Authorized Personnel Only
The Chief exits the station through an airlock and fights several Elite Rangers in the vacuum of space.


 * Cortana (COM): "Sir, boarders have breached the fire control center. They have a bomb."


 * Lord Hood (COM): "Can you defuse it?"


 * Cortana (COM): "Yes, but I'll need the Chief's help to make contact with the detonator."


 * Lord Hood (COM): "Chief, get to the bomb, double time! Cortana, prioritize targets and fire at will."

The Master Chief re-enters Cairo'' Station through the Port Shipping bay, where he is met by Marines near a cargo container. There is a loud buzzing sound and the Yanme'e make their first appearance.''


 * Fleet Admiral Harper (COM): "First Echelon, you're with me, blanket those cruisers, take ‘em out one by one. Second Echelon, keep those carriers busy."


 * Cortana (COM): "Registering all hostile vessels inside the kill zone. Thirteen cruisers, two Assault carriers. I'm going loud!"

The station's MAC gun begins firing at the Covenant fleet

(Later)


 * Cairo Defense Coordinator (Loudspeaker): "Alert! Boarders in Port Dry dock!"

(Later)


 * Cairo Defense Coordinator (Loudspeaker): "All non-combat personnel report to evacuation stations!"

As the Master Chief rides the elevator platform down to the airlock:


 * Fleet Admiral Harper (COM): "The carriers are breaking through, Sir! They're heading straight for the Cairo!"


 * Lord Hood (COM): "Cortana! Concentrate your fire on the first carrier. Admiral, do what you can against the second."


 * Fleet Admiral Harper (COM): "Everyone, form up. Follow my lead!"

The Master Chief watches through the window as the lift descends, a massive Covenant Assault Carrier accelerates right past the Cairo and towards Earth, somehow making the entire station shake despite it being in a vacuum.


 * Cortana (COM): "The first carrier completely ignored us, Sir! Blew through the Malta ' s debris field and headed straight for Earth!"

After crossing the MAC's recoil arm in vacuum, the Chief re-enters the station through an airlock.

Return to Sender

 * Cortana (COM): "Just so you know, there are quite a few Elites guarding the bomb. You may need to get creative."


 * Cairo Defence Coordinator (Loudspeaker): "All hands, we are abandoning the station!"

''The station shakes again. Outside the window, the Chief can see the second carrier bypassing the Cairo, following the first carrier down to Earth.''

Once the Chief clears the room of Covenant defenses:

{Cutscene}

Cortana's holographic avatar appears on a pedestal near the bomb.


 * Cortana: (urgently) "Me. Inside your head. Now."

''The Master Chief touches the pedestal, and Cortana downloads directly into his armor. He steps over to the bomb, and touches the flashing red activation pad at its centre. It blinks and turns blue. The threat is neutralized.''


 * Master Chief: "How much time was left?"


 * Cortana: "You don't want to know."


 * Commander Keyes (COM): "Cairo, this is In Amber Clad."

The view changes to the bridge of In Amber Clad.


 * Commander Keyes: "The carrier's shield is down. I'm in position and ready for immediate assault."

The view goes back to Cairo's bridge, showing Lord Hood alone.


 * Lord Hood: "Negative, Commander. Not against a ship that size. Not on your own."


 * Master Chief (COM): "Sir..."

The view changes back to the bay, where the Chief is waiting with one hand on the bomb.


 * Master Chief: "...Permission to leave the station."

The view returns to Cairo's bridge.


 * Lord Hood: (distractedly) "For what purpose, Master Chief?"


 * Master Chief (COM): "To give the Covenant back their bomb."

Hood pauses to think, and then agrees.


 * Lord Hood: "Permission granted."

''In the bay, the Chief grabs the bomb by two of its pointy protrusions and drags it across the floor, causing sparks to erupt as it scrapes across the metal plating. He drags it into an elevator, and ascends.''


 * Cortana: "I know what you're thinking, and it's crazy."


 * Master Chief: "So, stay here."


 * Cortana: "Unfortunately for us both... I like crazy."

''The elevator reaches an empty Longsword launch bay, and the Chief steps out, watching through the huge bay door. The entire fleet streams down toward Earth, chasing the Covenant ships. The Master Chief then steps up to the door's release handle, which drops down above him.''


 * Cortana: "Just one question. What if you miss?"


 * Master Chief: (Calmly) "I won't."

''The Master Chief pulls down the handle and the bay doors cycle open, the bay decompressing rapidly. Debris lifts off the floor and hurtles into space, and the bomb slowly begins to slide toward the doors, scratching sparks across the floor. The Spartan grabs hold of it as it passes, and is pulled out into space.''

''In free-fall, the Chief descends in the general direction of northern Africa. The first carrier is miles below him, too far to reach. The second carrier passes right below his position, and opens up with a energy projector, narrowly missing him. A cruiser rockets below him, takes an Energy Projector round right through its spine, explosions lighting all over its hull. The Master Chief plummets past it, watches as its engines fail and try to relight themselves.''

''A pair of Longsword fighters dive past him, and make a strafing run on the carrier. They open fire on the Carrier, and make a staccato beat of fire along the back of the carrier, allowing the Chief to slip through the narrow hole the blasts have created.''

''The Carrier's center is a huge, open chamber, a massive fusion core casting white light across its inner surface. The carrier has taken a lot of abuse; the far side of the chamber is torn open, showing the Earth outside. Master Chief crawls up the bomb, presses its activation panel, and spins around. His legs flex, and he vaults off the bomb, aiming for the split in the carrier's armor.''

''He plummets from the carrier, straight for Earth, as behind him minor blue explosions flicker up and down the alien warship. A pause, and the entire ship detonates in a huge plasma conflagration.''

As the Chief falls towards Africa, the In Amber Clad passes beneath him, matching trajectories.

Inside the In Amber Clad'' ' s bridge, Johnson and Keyes watch a tactical display. A thud resounds throughout the ship, and Johnson and Keyes look up.''

Johnson looks at Keyes and grins.


 * Sergeant Johnson: "For a brick... he flew pretty good!"


 * Commander Keyes: "Chief, get inside, gear up. We're taking this fight to the surface."

In Amber Clad banks hard and dives towards the Earth's atmosphere, and a massive, gray city along the East African coast comes into view.

Level ends.

Glitches

 * It is possible to get inside of the boarding ships, simply go to the corner of the shield barrier and walk forward and jump, this may take a few times but after awhile you should get in. Inside there is only a crate. When you walk out there is another glitch, the enemies that you fought when you entered the room will respawn, be careful, as the enemy will spawn directly behind you.
 * It is possible to reach areas that are supposed to be inaccessible to the player in this level.
 * In the sub-level "Return to Sender", it is possible to be pushed through the wall. Simply stand in front of the moving firing pin. You will be pushed forward at an incredible speed directly into the wall. After running into the wall, you will be able to see the wall as it really is: a textured line that is infinitely thin. After seeing this, you will simply "squish" through the wall, and fall to your death to the level below.
 * It is possible to fall below the MAC gun's pump. If you try to jump on the middle of the MAC cannon at the end of the level, it will launch you out of the station and sometimes you will hit an invisible barrier stopping you from getting to the scenery.
 * If you kill the Drones as the elevator is rising, one of their bodies might get caught on the edge of the elevator and look as if it's falling indefinitely.
 * If you melee the Grunts operating the turrets in the Pelican bay, sometimes their bodies get stuck through the floor and can be seen underneath. This is especially amusing when a Grunt is hanging down by it's hand as it looks as if it is holding on to the bars and hanging down.
 * It is possible to see the outside of a Covenant boarding craft on this level up close. Just before you enter the first elevator, use one of the structures near the edge to jump to a lower ledge, and there is the craft.
 * There is some old dialog where Miranda Keyes would say "Thanks, Chief. I owe you one. Take me now!"
 * When you get to the armory part and you see one of the stair doors is closed, get on top of the door and the door should be going up the ceiling. When the door closes, you will fall through the door and be back to normal instead of dying.
 * It is possible to get into the airlock room Master Chief jumps out of. On the chapter "Return to Sender", walk up to where the firing pin shoots forward. Walk up to the front track, and it will move forward. If you are lucky, your body will fall through the floor and down to the airlock below.
 * When you get outside of the Station, it is possible to get inside the FFG-142 In Amber Clad ' s reactors.
 * Right when you begin the level, head down the stairs, and on your right, there will be Johnson's commemorative hat lying on a case; if you melee the case, the hat will be floating about one meter above the ground, as if the case was still there.
 * Right after killing the Elites with jet packs for the first time, you can walk to the left of the area you came from instead of walking to the area where you're supposed to go and hop onto a nearby platform which will lead you to getting on top of most closed in areas you have previously walked through (hence on top of the Cairo Station) Although it is impossible to get on top of the tower.
 * It is possible to have two Sergeant Johnsons in the same place. The one that appears at the start of the level can be meleed to the area right before "Authorized Personnel Only" where another one is waiting for you. This is easier if you have an Energy Sword because if left alone for any amount of time, he'll run backwards.
 * On the elevator that leads to the bomb room, if you keep running to the diagonal doors you go through when the elevator stops you can see not only the outside of the elevator but the lower half of your body running up against the wall.
 * At the very beginning of the level, unlike in The Armory, it is possible to zoom the HUD while unarmed. However while zooming unarmed the edges of the screen do not darken in the shape of the Mark VI visor like they normally do. Instead the entire screen remains bright. Although the motion sensor disappears, the grenade counters remain visible.
 * If you get to the airlock quickly enough after you save Keyes and Johnson and kill the first wave of enemies (specifically before Keyes says "Thanks Chief. I owe you one."), the second wave of enemies which normally appear (Grunts and an Elite) will not spawn. A similar glitch is found in Regret.
 * Occasionally, a female Marine will spawn under the Pelican in the Hangar bay and will be killed as soon as she spawns.
 * While the Chief is outside the station, all sounds save those made by his Mjolnir armour are muffled, reflecting the silent nature of the vacuum of space. This muffling effect is not present, however, when Halo 2 is played on an Xbox 360.
 * On the elevator that leads to the bomb room, if you keep running to the diagonal doors you go through when the elevator stops you can see not only the outside of the elevator but the lower half of your body running up against the wall.
 * If a Marine is killed and falls into the area before the MAC Round storage area, their body will disappear when the loading point is changed.

Mistakes

 * Although Sergeant Johnson receives a medal in the ceremony before the mission and it is seen being placed on his chest, on the actual mission, it does not appear on his uniform except for the Purple Heart.
 * Despite Johnson's claim that the MAC platforms are geo-synchronized with their respective cities, if the player looks out of the Cairo's windows, Cairo Station itself is over 1000 miles from Cairo, Egypt; the city it is supposedly geo-synchronized with.
 * When Thel 'Vadamee was bound to the energy cuffs, his elbows were at chest level, while his wrists were at face level. After his armor was removed, his elbow was at face level, and his wrists were above his head.
 * Although the MJOLNIR armor system has only 90 minutes worth of oxygen, you can stay in vacuum indefinitely.
 * It's possible, when going outside the station through the airlock, to not kill the Grunts or Elites. They will stay alive, even though they are in the vacuum of space.
 * If you kill the enemies while in the vacuum of space you can still here them scream upon death. This is strange since sound cannot travel through space because of the lack of air.

Easter Eggs

 * The Thunderstorm Skull is located in this level.
 * Johnson's cigar is also found in this level, but it is put out, unlike in the Armory level, the cigar was lit up and smoke could be seen. You can see this if you find the Thunderstorm Skull on this level.
 * It is possible to hear Lord Hood saying something on the intercom about Megg in this level.
 * Also on the chapter "Return to Sender", you can find one surviving Marine. To do this, you must enter the room underneath the firing pin. Walk away from the Elites' position, and you should find a lone Marine survivor, armed with a Battle Rifle or an SMG. The Marine is a different model every time.
 * At the end of the level, where you have to disarm the bomb, there is a German Shepard's head. After you exit the elevator on the level, hop across the structure in the middle of the room, but be careful of the firing pin for the MAC gun, as it could crush you. After you're across, track backwards until you're at the opposite door. There will be debris to the upper left of you. If you maneuver in such a way, you will be able to see a piece of metal on the ground that looks like a dog's head.

Miscellaneous

 * This is the only level in which Elites wield Plasma Pistols.
 * This is one of three levels in the Halo series where the player is in vacuum, excluding glitches.
 * During the part where you meet Johnson and Miranda, you can melee attack one of them with you into the airlock where you proceed to the bomb. They will not die from the vacuum and can be strong allies due to their invincibility.
 * Three Stealth Elites with Active Camouflage are present on the bottom floor of the Armory, two being in the room and one appears in the corridor you came from. (Note that all difficulties permit the player to see them)
 * During this level, you can see Covenant Carriers flying past Cairo Station. You can see one when you're outside near the MAC fire control center and another when if you look out the windows inside the MAC fire control center.
 * The turret that appears in the first Pelican bay is not present on harder difficulties.
 * Originally, Bungie had planned a level after Cairo Station, in which the Master Chief would land on a Covenant ship, break in, and destroy it from the inside out. This was shown in the Halo 2 Announcement Trailer, when the Chief jumped out of the airlock without the bomb. However, because of deadlines, the level was cut from the final game.
 * On Legendary difficulty, a Zealot can be found not too far into the level.
 * It is possible to see an Ultra Elite with a dual-wielded Plasma Rifle and Needler, (Like with others, get too close or shoot him too much, he draws an Energy Sword) on Easy difficulty.
 * If you melee or shoot Commander Keyes, she grimaces in pain and glares at you resentfully.
 * In the final fight by the bomb, if you kill the Covenant in the right positions, it's possible for the bomb to move their bodies around while being dragged.
 * In this level, and in others like The Armory or Outskirts, you can see some equipment cases, where there is written information about some UNSC equipment such as Marine helmets or Marine body armor. The information shows their weight and the number of items included in the case.
 * In the room where the bomb is, you can find a Marine hiding in the back from the Covenant.
 * This level features a music piece that unfortunately didn't make it onto either volume of the soundtrack in any form. It is played in the Armory and Commons Area B-01, after you kill the two Elites that killed the Master Gunnery Sergeant. This "lost song" reappears on the level Gravemind.
 * You can complete almost all or all (If skilled in jumping) of the level without a weapon. Just keep jumping over weapons on the ground and running past covenant troops to the end and the marine at the back of the bomb room will hopefully kill all the covenant there.
 * In the airlocks at the top and bottom of the elevator platform, and the Port shipping bay are four ODST bodies (one at the top, one in the Port shipping bay, two at the bottom. These are the only ODSTs seen in the level. This is also the first appearance of the ODST armor in the Halo Trilogy.
 * The machine gun turret carried by Johnson at the beginning of the level, sometimes will not be usable; although you can order Johnson to stay away from it.
 * This level also contains the only Halo 2 Marine model covered in wounds and blood. He is found in the first Pelican hangar and is usually without a helmet.