There's a secret base in the Brazilian mountains. Kidnapped scientists are kept here, developing a tactical combat vehicle for terrorists. The vehicle is powered by a nuclear power cell, and is equipped with missiles, a machine gun and the latest powerful laser gun. The scientists cannot allow their invention to be used by terrorists, so they stole the key to the hangar to escape during the night. The scientists broke into the hangar to hijack the vehicles and freed the other hostages. After the hijacking, they leave the holding area and take a cargo ship to cross the border of the protected area. But on the way, the river is blocked with rocks...