In July 1941, Stalin learned of a single KV-II that had held off the entire 6th Panzer Division for more than a day. With the incredible success of this single tank, Stalin ordered a crash program for a land battleship based on the KV-II design.
It was to have three turrets and be very heavily armed and armored and able to defend itself against all types of attack.
The project was given to the joint team of Kotin/Barkov. When the designers complained to Stalin that the insistence on three turrets made the vehicle too long to have an acceptable turning radius, Stalin's answer was: "It doesn't need to turn, it will drive straight to Berlin."
The first prototype was completed in December 1941 and was rushed into the defense of Moscow. In its first action during a dense winter fog, the rear turret accidentally fired into the center turret. The resulting explosion completely destroyed the vehicle.
The second prototype was completed in January 1942, and was sent to the Leningrad front. This one had indicators installed to show whe another turret was in the line of fire. In its initial attack on the Germans, the tank broke in half when crossing a ravine. A spark ignited the leaking flamethrower fuel and the resulting explosion completely destroyed the vehicle.
The third prototype, shown here, had a reinforced hull and was also sent to the Leningrad front in early 1942. It did manage to shoot down three German aircraft. In its first ground engagement, the KV-VI was firing on German positions when coincidentally all of the guns fired from the 3 O'Clock position a the same time. The tremendous recoil tipped the tank into a ditch and the severe jostling set off the 152mm ammunition, which completely destroyed the vehicle.
After these failures, Stalin cancelled the project, and many of the design team members spent the rest of their lives in the Gulags of Sibera. The KV-VI was nicknamed "Stalin's Orchestra" by the few Germans that encountered it because of the variety of weapons it deployed.
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