During WWII, Soviet leader Stalin was so encouraged by a story of how one single Soviet KV-2 tank was able to hold off an entire company of German tanks. This encouraged Stalin to ask his military engineers to build a form of supertank or a sort of land battleship. One design was this KV-VI which was a monstrous size with more than enough firepower to hold 0ff land forces and troops. However, the huge design likely presented a big target for enemy aircraft. But, it was an interesting example of a wild WWII secret weapon.