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.