[2] Development was cancelled in 1960 following Nikita Khrushchev's orders to stop production of all heavy tanks weighing over 37 tons.

[3][4] In 1956, the GBTU (main armour directorate of the USSR) laid out the tactical and technical requirements for a new heavy tank.

From the get-go, the Object 770 was intended to be designed from scratch and implement numerous advanced technologies.

[2][5] It proved superior to the 277 in almost all aspects, but never entered field trials due to dangerous torsional vibrations in the engine.

The Object 770 had a fully cast design, with a dome-shaped 3 man turret (and a driver in the hull).

[1] The Object 770 also incorporated NBC protection, an automatic fire-fighting system, thermal smoke equipment and night vision devices into its design.