Development of the IS-4 began as early as 1943 at the ChKZ plant in Chelyabinsk. After the complicated and convoluted development of the first series of prototypes under index Object 701, the project was abandoned. However, in 1946, the project was revived due to issues with the IS-3. Redesigned and equipped with the 122 mm D-25T gun, the tank would enter production in late 1946. Due to major production and reliability issues, it would not enter service until 1947. Even so, its entire service history was plagued by poor reliability. A mid-life upgrade was made in the 1950s, but the tank would still see only limited service, and, eventually, in the late 1960s, most met their dishonorable end as stationary bunkers along the Soviet-Chinese border. This video article has been made in collaboration with @The_MightyJingles If you haven't already, make sure to check out his channel! Join this channel to get access to exclusive perks: https://www.youtube.com/channel/UC2tZSN6WSAtzKLalKbflBLg/join If you liked this video, please consider donating on Patreon or Paypal! Patreon: https://www.patreon.com/tankartfund Paypal: https://www.paypal.com/paypalme/tankencyclopedia Article: https://tanks-encyclopedia.com/coldwar/soviet/is-4-object-701/ Sources: IS-4 Operator Manual Soviet Heavy Tank IS-4 – Maxim Kolomiets Stalin’s Superheavy tank IS-7 – Maxim Kolomiets Domestic Armored Vehicles 1941-1945 – A. Solyakin, I. Zheltov, I. Pavlov, M. Pavlov Domestic Armored Vehicles 1945-1965 – Ivan Pavlov, Mikhail Pavlov IS Tank – Igor Zheltov, Alexander Sergeev, Ivan Pavlov, Mikhail Pavlov Armor Collection No.3 1996 – Mikhail Baryatinsky Designer N.L. Dukhov and his School – Yu.V. Rozhdestvnsky, V.N. Bondar TiV No.1 2013 p.47-60 – M. Pavlov, I. Pavlov IS-4 tank (btvt.info) Tank Archives: IS-4 Start to Finish Tank Archives: Object 701 Trials Forum icvi.at.ua The Heaviest Tank of the USSR | AllAboutWarThere | Zen (dzen.ru) IS-4 – The Epic Fail of Soviet Post-War Tank Building | Stalinium armor, comrade! | Zen (dzen.ru) Tank 701 – From First Prototypes to IS-4 | Stalinium armor, comrade! | Zen (dzen.ru) IS-4 in real operation | Stalinium armor, comrade! | Zen (dzen.ru) IS-4: From “Reliable” Prototypes to Complete Failure | Stalinium armor, comrade! | Zen (dzen.ru) How to make screen armor? Soviet recipe 1948 (topwar.ru) Забайкальские укрепрайоны. Разграбленная мощь. – Хроники “Вьетнамских комсомольцев” — LiveJournal Tank OT based on IS-4 – KaUR, APK-museum (nortfort.ru) Fortifications with tanks – 0011.htm (narod2.ru) Tank Encyclopedia Magazines and Books: https://payhip.com/TankEncyclopedia Reddit: https://www.reddit.com/r/TankEncyclopedia/ TE Shop: http://www.tanks-encyclopedia.com/Goodies/tanks-posters.php Our website: http://www.tanks-encyclopedia.com Gaming News Website: http://www.tanks-encyclopedia.com/games/ Facebook: https://www.facebook.com/tanksencyclopedia Twitter: https://twitter.com/tanksenc Discord: https://discord.gg/3VjQ8Zq Email: tanks.encyclopedia@gmail.com An article by Pavel Alexe Narrated by @The_MightyJingles Edited by @BattlehammerWoT Music by @WhiteBatAudio