Underground is a close quarter combat Search & Destroy map sets within various underground tunnels. It is currently available in the following version:
- Underground Base (China).
- Bunker (North America, Europe, Philippines).
- Under Base (Indonesia, Korea).
- Warehouse (Vietnam).
- This map look somewhat similar, to an extend obviously, to the map Supply in Alliance of Valiant Arms.
- This is the first Search & Destroy map to finally use background sound effects to create an ambiance.