secret documents

The secret document about the British UFO disappeared
Intelligence documents related to an unidentified flying object (UFO) near an air base in the UK in 1980 disappeared, the country's National Archives announced.
Russia announces confidential documents about the first astronaut
The Russian government has announced 700 pages of confidential documents about the life of Yuri Gagarin, the first person to fly into space, and his historic flight 50 years ago.
Announcing the cause of Gagarin's death
The first astronaut to fly into space died when his plane dived to avoid a hot air balloon in 1968, documents recently declassified by the Russian government.