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. This means Survivors can be easily attacked if they're not paying attention.
 * Just before reaching the crashed airliner, there is a dead body of a soldier that seems to have parachuted from a plane. He often has a few weapons on him and either a pipe bomb or a molotov.
 * The fact that a soldier would be equipped with non-standard issue weapons like molotovs and pipebombs might mean the military sees these weapons as a better weapon compared to their military counterparts. However, it is also possible the military is running out of supplies, and must resort to home-made variants during the crisis.