Comparing: Kirovets-1 vs. VK 100.01 (P)

The Kirovets-1 project (IS-3, prototype No. 1) was developed from July through November 1944. The prototype was built at the Chelyabinsk Kirov Plant in September–October 1944. From December 18 through December 24, 1944, the vehicle underwent trials at the NIBT proving grounds in Kubinka. After it was decided to manufacture a pilot series of the modified IS-2 with a hull proposed by engineers of Plant No. 100 and Сentral Research Institute-48, the work on the Kirovets-1 was discontinued.

A version of the Maus from June 4, 1942. The 120-ton predecessor of the superheavy tank existed only in blueprints and never saw service. The vehicle was only an intermittent stage in the development of the Maus.