Zenit-4
Failure
JUN 20196700:00:00 UTCImproper separation of Blok D strap-on at staging led to it colliding with the Blok A core stage and rupturing its RP-1 tank. Launcher exploded when leaking propellant came into contact with the engine exhaust.
LIFTOFF
JUN 20 196700:00:00 UTC
Failure
launched from Pad 41/1 Plesetsk
aboard Voskhod
Payload