The Maus is a Super Heavy Tank and the heaviest fully enclosed armored fighting vehicle ever built, designed by Porsche for Nazi Germany from 1942; only two prototypes were completed and the type never saw combat, with its 188-tonne weight making it impractical for most bridges and roads. The vehicle is tracked and crewed by five — driver, gunner, commander, and two loaders — and is powered by an MB 517 diesel engine (or electric transmission in the prototype) producing 1,200 horsepower for a 6.4 hp/t power-to-weight ratio and a top speed of 20.7 km/h in both directions, with neutral steering.
The main armament is the 128mm KwK44 with a 19.3-second reload and PzGr 43 and Sprgr. L/5 ammunition; a coaxial 75mm KwK44 provides secondary fire with Sprgr. 34 and Hl.Gr 38C. The turret has no stabilizer; the gunner uses a 3× telescope sight with no rangefinder. The Maus relied on extreme armour thickness for survival, at the cost of mobility and strategic deployability.
