Developed by Russian engineers Nikolai Lebedenko, Alexander Mikulin, Nikolay Yegorovich Zhukovsky, and Boris Stechkin, the Tsar Tank was meant to send enemies running in fear during WWI.

The tanks are T-55s, a model first commissioned by the Soviet Union’s Red Army in 1948, shortly after the end of World War II. They’re so old, you can find them in museums.