Battle Beneath the Earth (1967): A Chinese general goes berserk and has a system of tunnels dug all the way from China to USA, under the Pacific Ocean. The man who has discovered this is locked up because they think he is insane. US Navy soldiers go underground to repel the invaders.

The Ultimate Warrior (1975): Virus holocaust is not the only plague that threatens our future. New York City, 2012 A.D. In a plague devastated world, one tired man finds a reason to fight.