Found and Explained Official on MSN

Nazi Germany's battleship on tracks - P.1000 Ratte

The P.1000 Ratte was a proposed 1,000-ton German Land Cruiser, a 39-metre tracked fortress designed around two 280 mm naval ...
The P.1000 Ratte was a proposed German land cruiser powered by submarine engines and armed with twin 280-millimeter naval guns. The four-story vehicle would have carried heavy armor, antiaircraft ...