Halo 3 ODST (Mission 6) ONI Alpha Site Walkthrough

Video Walkthrough: Halo 3 ODST (Mission 6) ONI Alpha Site Walkthrough

This mission begins with you on a bridge and a shit load of Covenant heading in your direction. Your first task is going to be arm all of the charges while retreating to the opposite end of the bridge. My advice is to avoid fighting any of the Covenant - at most use your Spartan Laser to take out an enemy that's too close or a Banshee that's being annoying.

Once all 3 charges have been armed climb the ladder to the small tower next to the bridge and interact with the computer terminal inside. This will detonate all of the charges on the bridge killing (most) of the Covenant as a result. A few Wraiths are still alive on the opposite side of the bridge and they keep shooting at you until you leave the area which could very easily get you killed if you're not careful.

Inside the tower you'll find a Sniper Rifle if that interests you and you'll find more weapons along the two platform-outskirts of this area. When you're ready to proceed with the level head southeast through the open door and into our next battle arena.

Any of you who have played Firefight may recognize this next area as the Security Zone Firefight Map. Instead of starting out at the top of the area though, we're coming in from the side enemies normally spawn on. Two Hunters will be dropped off when you first arrive and dozens of Covenant will be dropped off after them. All you need to do is kill enemies in this battle arena until you're told to fall back inside the ONI building. You can find the ONI Building at the top of the stairs, it's the same spot you spawn at during the Firefight map.

I think it takes a total of 5 minutes that you have to survive before you're told to fall back into the ONI building. At least that's how long it took in my ONI Alpha Site Video Walkthrough. Just like before, if any of you have played ODST's Firefight you may recognize the inside of the building from the Alpha Site Firefight Map.

This location is going to be our next battle arena. You have a turret in the center of the arena which you can point at the two entrances in front of you - but not the two behind. Surrounding the turret you'll find numerous weapons, grenades and Health Packs incase you need them at any point.

For the first wave of Covenant you're going to be dealing with Grunt suicide squads. They will come running in holding two Plasma Grenades and you'll have to take them out before they get to you. After dealing with the suicide squads Mickey will call out where enemies are coming from, they'll alternate between the left and the right. Just keep your eyes and ears open and you should be fine.

Eventually enemies will stop coming in the front entrance and there will be a brief lul. Phantoms will drop off a bunch of Covenant in the outdoor atrium area behind you during this period and you'll have to turn around and deal with all of them. Once everything is dead you'll get contacted over the radio to return to the elevator and evac to the roof.

You can find the elevator in the central part of this area near the turret we used earlier. Before entering the elevator I recommend you bring weapons that you can use to effectively fight Drones. You'll be dealing with them during the ride up to the roof. Once you're ready hop into the elevator and hit the button to catch a ride to the roof.

Our last battle arena for this level is the roof. There will be a Phantom up here offloading a bunch of Covenant which you'll have to eliminate before we're able to leave. After you clear out most of the Covenant a Pelican will arrive with a turret on the back and help you with the remaining few.

When everything is dead hop onto the Pelican and fly it out of this area.

 

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