With Leningrad surrounded, the ambitious production plan for the KV-3 heavy tank was curtailed until a new plant could be established in the Tankograd complex in the Urals. If the plan had not been changed, production of the KV-3 could have finally got under way in 1942. The first KV-3 tanks would have been ready for the Summer offensives. With their over-taxed supercharged engines, there were likely to have been technical problems at the beginning. However, by the time of Operation Uranus, the battle to surround Stalingrad, their could have been many more of them in place of the KV-1s that actually fought there.