Abstract: A method is disclosed for operating an underwater vehicle. According to the method, the pressure difference between a container which can be filled with water and/or gas, especially air, in order to alter the weight of the vehicle and the water pressure outside the vehicle, is regulated to a predeterminable set value. A suitable device for carrying out this method, includes a circuit for regulating pressure difference between the pressure inside the container an the water pressure outside the vehicle to a predeterminable set value.

Abstract: A method and apparatus are provided for enhancing the internal combustion engine performance, particularly the performance of charged diesel engines for charging batteries for submarines in snorkel running, whereby the exhaust gasses generated by the internal combustion engines during snorkel running are introduced into the water that surrounds the submarine, and whereby a reduced water pressure is created in at least one region at the submarine via flow-oriented measures by way of the motion of the submarine through the surrounding water, and the exhaust gasses are introduced into this region, for which purpose mechanically actuated flow-directing elements are arranged at the submarine.

Abstract: The invention relates to a method for operating an underwater vehicle (1,2). According to said method, the pressure difference between a container (4) which can be filled with water and/or a gas, especially air, in order to alter the weight of the vehicle, and the water pressure outside the vehicle, is regulated to a predeterminable set value. The invention also relates to a suitable device for carrying out this method, comprising a circuit for regulating the pressure difference between the pressure inside the container and the water pressure outside the vehicle to a predeterminable set value.