Soviet Documents Reveal Nuclear Cache in Poland

In the 1960s, the Soviet Union built massive bunkers in Poland. These bunkers didn't appear on maps, and were carefully concealed to be invisible to spies from the air.

But now, these long-abandoned buildings are revealing some of the secrets of Russian military strategy during the Cold War.

Soviet documents from that time period described the sites as communications centers, though the buildings vanished from official records soon after they were built. Indeed, at the time, the Soviet Union denied having nuclear weapons cached anywhere in Poland.