The Nanoswarm is a defensive Super Weapon, much like the Soviet Iron Curtain. It functioned a little differently, however. The shield that is formed is literally a shield. While it is online, no attack can break through it and no units from the outside can enter the shield area. However, the units inside the Shield cannot fire out or move out of the protected area either, although they are free to attack enemy units which are also trapped inside the Shield.