Battle Beneath the Earth (1967)
Extremely silly British science fiction film. Starts with two cops in Las Vegas getting a report of a "listening disturbance." This turns out to be a guy with his ear on the sidewalk, muttering about how "they sound like ants." His rantings have somehow managed to draw a crowd, so the cops disperse it and take the guy to the hospital. He demands that our film's hero gets in contact with him.
Our hero is a Naval officer who has been reassigned from an underwater habitat project, because it was destroyed by a tremor, to lab work. He gets the message from the listening guy from a lab assistant, who just happens to be his sister. Our hero flies to the hospital, which, incidentally, has slot machines for their patients who are compulsive gamblers.
The guy isn't really crazy, although he sure acts that way; he's discovered that a renegade Chinese general has a private army, and he's dug all the way from China under the Pacific Ocean, and has no less than three tunnels dug across the USA filled with atomic bombs. This nutty premise leads to a few US soldiers fighting a few Chinese soldiers underground.
With the exception of minor characters, the Chinese characters are played by Occidental actors, which is really embarrassing. Not to mention that the atomic bombs have dragon symbols on them, the general's hideout is full of stereotypical Chinese décor, and so forth. He also has a pet hawk that plays no part in the plot, and is just there to tell us he's an evil megalomaniac.
The whole thing is like a grade school student's idea of a James Bond movie. There's a Bad Girl, who uses what is obviously an ordinary handheld battery-operated fan to hypnotize the hero, repeating over and over the little poem "Red is green and green is red. The East is sunrise, the West is dead." There's a Good Girl, a science type, who doesn't do much. Since this G-rated movie seems to have been made by children, they both remain fully clothed and the hero doesn't smooch on either one. The bombastic jazz soundtrack is another source of mirth.