What we had been waiting for and fearing for a long time happened in the Dark Sector - alien aggressors began an attack. Moreover, they chose underground secret tunnels that lead to the most important control nodes. If they are paralyzed, victory will be achieved quickly enough and with minimal losses. But the evil aliens do not know that their plans have been revealed and they are already waiting for them. The organization of effective defense depends on you. Place guns that will fire at the enemy as he moves towards the goal in the Dark Sector.
