A massive bug mound has appeared outside of Buenos Aires. S.I.C.O.N. thinks the Bugs are going to assault the city again so they try to bomb the mound from the air. Plasma Tanker Bugs shot the planes down though and, because they keep changing location the air attacks are unable to neutralize them. So the Roughnecks are sent in with four other squads to locate and destroy the Tanker Bugs so the mound can be bombed to destruction. The squads dig in and hide whilst s decoy force lures the Warrior Bugs defending the Tankers away. Rico's group is almost detected by a Bug but Carl is able to mentally change its view and thus save the group. As the squads move in at night the game is given away by a trooper from another squad who launches a grenade at some Bugs. However this turns out to have a positive effect as all the Tanker Bugs start to fire all at once believing it's another aerial attack thus revealing all their positions simultaneously. The squads launch a missi