The Swamp

The Swamp is the second chapter of the campaign Swamp Fever in Left 4 Dead 2. It begins in a train underpass fashioned into a safe room for the first chapter. The Survivors temporarily touch ground, but then move on to planks resting over the water. Once the planks end, the group finds the ruins of a long abandoned boat house and a dock, which happens to be loaded with various supplies. Nearby, there is a plume of smoke above the trees. The path leads into a clearing with a crashed plane. On the way to the plane the survivors can find a parachutist, dead, stuck in the trees and occasionally find T2 weaponry near the dead parachutist. Fortunately, the aircraft is filled with supplies. The crash has slowed the Survivors' progress, however, and they must open the emergency exit to proceed—which, of course, triggers a Crescendo Event. Once they have weathered the hordes of the Infected, the group makes their way through some ravaged old shacks and into the next safe house.

Trivia

 * The plane is similar to the ones in Metro International Airport, implying a relation to the airline.
 * Witches can spawn within the swamp completely submerged in water. Survivors can be easily attacked if they're not paying attention.
 * Just before reaching the Crashed Airliner you can find a dead body of a Soldier that has parachuted from a plane. He has either a couple of weapons stuck on him and he will have a pipe bomb or a molotov on his body.
 * The fact that a soldier would be equipped with non-standard issue weapons (molotovs and pipebombs) might mean the military sees these weapons as a better weapon compared to their military counterparts.