Battle Beneath the Earth (1967)🔸

Battle Beneath the Earth is a 1967 Anglo-US science fiction thriller film. It features Kerwin Mathews, Viviane Ventura, Robert Ayres, Peter Arne, Martin Benson, and Ed Bishop. 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.