Down the Drain

The Enigma machine is to be smuggled to England in the midget submarine. René is told to put it into a wine barrel and drop it into the sewer. At a designated time, all of Nouvion will flush their toilets and the resulting surge of water will send the wine barrel along the sewer to the submarine.
The British lay on an air raid as a diversion, but manage to bomb the pumping station by mistake, so there's no water with which to flush the toilets. It's discovered that Monsieur Leclerc has put the wrong box in the wine barrel. The Enigma machine is still hidden in the café.

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S05E26 - All in Disgeese