The Ratte

A Colossal Tank (that's based on reality of a cancelled project in early 1943). a Living tank.

Main gun - The primary armament consisted of two 28 cm SK C/34 naval guns, the same guns used on German battleships.

Other Guns - Additionally, it would have eight 20 mm Flak 38 anti-aircraft guns and two 15 mm Mauser MG 151/15 machine guns for defense against aircraft and infantry.
The Landkreuzer P. 1000 Ratte was a proposed super-heavy tank designed for Nazi Germany during World War II. While it never progressed beyond the planning stage, its proposed armaments were quite extensive .

Main Armament

• The primary weapons were intended to be two 280 mm 54.5 SK C/34 naval guns. These guns were to be housed in a modified turret, potentially taken from the Gneisenau-class battleships. The modification would have involved removing one of the guns and its loading mechanism to create more space for ammunition .

Secondary Armament

• A 128 mm KwK 44 L/55 anti-tank gun, similar to those used on the Jagdtiger or Panzer VIII Maus, was also planned .
• Eight 20 mm Flak 38 anti-aircraft guns were to be included, possibly in Flakvierling quad mounts .
• Additionally, two 15 mm Mauser MG 151/15 autocannons were part of the design .

Back Turret Guns

Back guns - Some sources suggest the inclusion of two Panzer VIII Maus turrets, each equipped with a 128 mm gun, mounted on the rear of the Ratte. However, evidence supporting this is limited, and the exact configuration and placement of the secondary armaments remain a topic of debate among historians.

Max speed - It was projected to have a maximum speed of about 40 kilometers per hour (25 mph) on roads and significantly less on soft terrain. (seems it weight 1,000 tons).

Rear guns - two MAUS turrets equipped each with 180mm gun and they are attached on top each side from left to right. Plus they rotate to 360.