Floodgate Vacation

The Floodgate Vacation is a glitch that can be performed on the Campaign level, Floodgate. It allows you to get out of the level's boundaries, and walk around outside the map.

Tutorial
Load up Floodgate from Rally Point Alpha, two player Co-op, any difficulty, preferably Easy, and get to the point where there are shipping crates stacked close to the roof. This is where you will be doing the glitch. Continue on and kill all of the Flood, and then have each player get a Deployable Cover. Walk back to the area with the shipping crates, and grenade jump up to the first shipping container. Next, deploy your first Deployable Cover to get up to the top shipping container. Once up there, jump over onto the roof. Walk until you get to the pipes, then turn around. Walk up the ramp to the roof, and walk diagonally across the invisible wall and you will eventually get out of it. At this point, you are out of the map. To get even further, walk towards the high roof, and find where the invisible ceiling drops down. Throw the second Deployable Cover right before that drop and use it to get up to the roof by crouch jumping off of it. Now you are free to explore the whole Flood ship and roof.

Other Stuff

 * If you fall back into the map from outside, you will die from a kill barrier before you touch the ground