Question: Who canceled the project for the Landkreuzer P. 1000 Ratte, which would have surpassed the Panzer VIII Maus as being the heaviest fully enclosed armoured fighting vehicle ever built?
Sentence (from "Panzer VIII Maus"): Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by the advancing Soviet forces.
Relevant evidence: No