Lawrence Livermore National Laboratory

Because of their top secret status, about 10,000 reels of film recording the 210 above-ground nuclear tests conducted by the United States between 1945 and 1962 were allowed to rot in high-security vaults across the country.

A CIA document has revealed that two nuclear submarines collided in a sea loch just off the west coast of Scotland more than 40 years ago.
The top secret memo, which has just been declassified, tells how a US submarine collided with a Russian vessel near Holy Loch in November 1974.
The cable marked “Secret eyes only” was sent to US secretary of state Henry Kissinger.