The OT-64 is pricipally the Czechoslovakian-Polish counterpart of a BTR-60. Yet a well advanced one. There only is one Tatra diesel air-cooled engine in. It is positioned in the middle, which not only better balances the vehicle but opens rear access to the troop's compartments as well. The fuel consuption is considerably lower. Side doors make driver's compartment easier to access. Semi-automatic transmission (Wilson), air-powered, assures smooth gear-shifting. The vehicle floates, but it is not really a swimmer which would serve you, say to cross a large lake and is not sea-worthy. If looking for a swimmer, turn to a BRDM-2. Many parts are identical with standard Tatra trucks, and so they are cheap.