Operation Neptune (espionage)

Operation Neptune's objectives were to discredit Western politicians by revealing the names of former Nazi informants whom they were still using as spies in Eastern Europe and to place pressure on West Germany to extend the statute of limitations on the prosecution of war criminals, including extending the statute of limitations.

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In 1964, the Czechoslovak State Security publicly claimed to have discovered Nazi-era intelligence files hidden beneath the surface of Černé jezero, a Czech Republic lake in the Šumava, on the border with West Germany.

The four chests containing the papers were supposedly discovered during the making of a documentary in the presence of members of the Western press. In fact, State Security itself had placed them there in collaboration with the KGB.

The apparent discovery was a disinformation operation, the largest conducted by the State Security. The fake papers were found in sunken chests, which had been carefully doctored to appear as if they had been submerged since World War II. The chests had been brought from the Soviet Union. The agent who led the divers to make the discovery and who had originally placed them in the lake, Ladislav Bittman, later known as Lawrence Martin-Bittman, defected to the West in 1968 and published a book on the plot.

One scholar argues that the papers were possibly genuine although the former Czechoslovak spy Josef Frolík described them in his 1975 memoirs as forgeries.