The Super Heavy Tank is found in the upper levels of Survival mode. It is unattainable in other modes such as Conquest. It appears to be larger than the regular tank and has better stats than a regular heavy tank. This could be inspired by the Landkreuzer P. 1000 Ratte.

Screen Shot 2017-06-23 at 8.46.46 PM

Next to an Anti-Air Tank for size comparison