The T-34 rolled off Soviet assembly lines unpainted and straight into the fires of Stalingrad, and more than 80,000 were eventually built. This episode traces the tank from its origins in the border clashes with Japan in Manchuria, where petrol engines and riveted armor turned Soviet tanks into death traps, to engineer Mikhail Koshkin’s vision of a universal tank with a V-12 diesel engine, wide tracks, and heavily sloped armor. Koshkin drove two prototypes 1,200 miles through the winter of 1940 to prove the design, a journey that cost him his life just as the first production models appeared.

We then follow the desperate relocation of Soviet industry over the Urals to Tankograd, the automated submerged arc welding of Evgeny Paton that cut the unit cost in half, and the rough welds, leaking joints, and brittle armor that American engineers discovered at Aberdeen Proving Ground. From the German 37mm door knockers that bounced off its hull to the seven-to-one loss ratios caused by blind two-man turrets and failing transmissions, the T-34’s story is one of pragmatism over perfection, culminating in the T-34-85 and a post-war career stretching from Korea and Angola to Red Square.

• Why Molotov cocktails and snapping rivets made early Soviet tanks a nightmare for crews
• How Koshkin’s sloped armor, diesel engine, and wide tracks changed armored warfare
• Inside Tankograd: moving 1,500 factories and slashing costs from 270,000 to 135,000 rubles
• Spalling, jammed gears, and the sledgehammers drivers kept to shift the early T-34
• Why 22,000 T-34-85s outweighed 2,000 Tigers and how the tank lived on for decades