After the initial onslaught, a decision was made to take the subterranean rescue efforts, to somewhere free of the alien infestation. Scientists had recently discovered that the strange lifeforms that had been assaulting Elysion One would only venture so far into the earth. While this is good and all, there remains one small problem: someone has to keep them at bay while the operation is moved deeper into the earth. Guess who will be part of the lucky battalion? This DLC adds the 'Caverns' map to your library of accessible content. With this DLC, you will be able to host games on this map and engage in single-player conflict.