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Gen. Burkhalter's radio detection unit is making it impossible for the prisoners to deliver the new German codes to London, until a live bomb shows up in camp to distract the Nazis.
After the prisoners' tunneling causes a water pipe to burst, Hogan convinces Klink that there's a mineral spring beneath the camp.
The Germans are testing a remote controlled tank at Stalag 13, motivating the prisoners to thwart their efforts.