Voyage to the Bottom of the Sea (1964)

S1E4 The Mist Of Silence

During a covert operation, Crane and his crew find themselves incapacitated by a drug on an abandoned yacht. When they regain consciousness, they discover they’re imprisoned in a South American jail, where each man is led out to the courtyard for execution, one by one, every hour. They face certain death unless Crane betrays his oath and reveals secrets he cannot share. Can Nelson successfully carry out a rescue? Will the nation withstand the sinister plans of the villain intent on seizing control?