Coal Freighter

Coal Freighter is a map featured exclusively in Survival Mode as part of the unfinished campaign, Dam It. The map does not appear in the main campaign itself. The map consists of the top deck of a coal freighter ship, with weapons, ammo and items such as pipe bombs available on the deck. For every couple of minutes that the team survives, a new hatch opens up on the main deck, which drops down into a cargo hold. It becomes increasingly difficult for Survivors to remain on the top deck without falling in as more hatches begin to open.

Gameplay
As with a map such as The Lighthouse, the only goal is to survive for as long as possible, rather than reaching a safe room or gathering gas cans as with Scavenge Mode. The Survivors have as much time as they want to set up before flipping a switch on the top deck to trigger the horde. As such, it is impossible to survive indefinitely, and the round must always end with the death of all Survivors.