The O-I Super Heavy Tank was a prototypetankdeveloped by theImperial Japanese ArmyinWorld War II. The vehicle featured a multi-turreted design and an immense weight of 150 tons, second only to theMaus. While stronger than any available Japanese tank at the time, it's immense weight and size made it unfit for the Pacific theater, with only one turret-less prototype being developed for trials.
o-i (tank)