On June 4, 2004, Marvin Heemeyer, a welder and former Air Force serviceman, unleashed chaos on Granby, Colorado, with a DIY tank. His creation—a heavily armored, modified Komatsu bulldozer ...
Right now, the amphibious bulldozer can dive only to a depth of seven meters (about 23 feet) because of GPS limitations. However, Komatsu plans to increase its operational depth to 50 m (164 ft).