Dead Air

Dead Air is the fourth(originally, third) campaign in Left 4 Dead, spanning five chapters. The Survivors must make their way through Newburg to a runway in hope of catching a plane from Metro International Airport to get away from the Infected. To get there, they must start their trek from a greenhouse, head past a crane, move through a construction site, traverse the airport terminal, and finally reach a runway where a military C-130 Hercules airplane is waiting to evacuate them.

Below are walkthrough videos for each of the 5 chapters:


 * 1) The Greenhouse
 * 2) The Crane
 * 3) The Construction Site
 * 4) The Terminal
 * 5) Runway Finale

Please know that the gameplay videos are on each campaign's info page not on each map page.

Official description
Guide your team of Survivors out of the downtown core of Newburg's business district, through derelict office floors and still-inhabited cubicles, and out onto the runway of Metro International Airport, where the only thing standing between you and the last plane out of the city is a murderous army of the undead.



Graffiti

 * There are several instances on the rooftops where one may find writing, such as "Help! Need food." or "S.O.S." There are also numerous writings about how a bomb will be dropped on the airport.
 * In The Terminal's starting safe room, a piece of graffiti states; "WE ARE THE REAL MONSTERS" on the wall, along with various other messages below it telling the writer that they are a moron, telling them that the Infected are the real monsters, and somebody even tells them that he wishes that they are dead now.
 * On the same wall, written in small letters, is the infamous graffiti, stating; "I miss the internet".
 * In one sentence, it claims that the Infected were created by the military. Following that, there is a rumor that the government is giving a cure to the rich. Below that is a claim that the virus was made by aliens, along with a writing saying "What if this was first contact?" followed by "What if you're an idiot?!"
 * Several times throughout the campaign, the phrase "God is dead" can be seen. This was a statement originally made by the German philosopher Friedrich Nietzsche, and has heavily been quoted since. However, the phrase could have also been a reference to a line in the final act of, The Crucible. Occasionally, the Survivors may respond to the writings, saying things such as, "Oh, no! The zombies killed God!"
 * In the safe room of The Crane, there is some graffiti on the wall that states "This is our punishment." Right under this is the sentence "It's just Dead Air." - a reference to the title of the campaign.

Behind the Scenes
Only one screenshot of Dead Air was shown before the game was released. Judging by it and the early Runway image in the game's files, Dead Air was supposed to have a light blue tint at one time.