* Astronomy

February 21, 1969 - Vehicle serial number 3L - Zond L1S-1 (Soyuz 7K-L1S (Zond-M) modification of Soyuz 7K-L1 "Zond" spacecraft) for Moon flyby - Due to unexpected high-frequency oscillations in the gas generator, one of the pipes broke apart and a fire started. This fire reached the engine control system which at 68.7 s of flight sent the command to shut down the engines. The rocket exploded at 12,200 m altitude, 69 seconds after liftoff.
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