For almost six years, submariners of the Third Reich fought in the Atlantic against Allied convoys, trying to carry out an underwater blockade of Great Britain. Subordinates of the Kriegsmarine submarine force commander, Karl Dönitz, used group tactics to attack convoys, which became known as “wolf pack” tactics. For this, German submariners received the nickname “gray wolves” from the enemy. Over these six years, according to the British Admiralty, German submarines sank 2,775 merchant ships with a total tonnage of 14,573,000 GRT. However, for every thousand submarine commanders who took part in hostilities, only 34 people achieved a striking result, namely, sinking 100,000 GRT or more of merchant tonnage. They are usually called underwater aces. These 34 aces sent 873 ships to the bottom with a total tonnage of almost 5 million gross tons (4,826,238). German submarine aces are not very well known to Russian history buffs. This book is an attempt to close the existing “gap” in the knowledge about German submariners and the submarine war they waged. The reader can get acquainted not only with the actions of such famous submarine commanders as Otto Kretschmer and Wolfgang Lüth, but also discover lesser-known personalities of the Battle of the Atlantic - Otto Ites, Werner Henke, Hans-Hartwig Troyer and others.