Between the time the first British ship sank - September 3, 1939 - and the day - May 7, 1945 - when a RAF bomber sank a German submarine, German submarines sank about 2,800 Allied merchant ships, with a total displacement of 14 million tons.

Opinions about German submarines and the men who sailed them remain divided. Heroes or pirates? Captain Lyt sunk nearly 50 ships with a total displacement of 230,000 tons. He completed 16 war patrols with four different submarines, and on his last patrol, he remained at sea for 203 days, a record time.

"U-Boat Strikes Again" is an extremely rare book published in 1944 amid the war. It has never been reprinted or translated. The Greek edition is unique.

It is a record of two top commanders of submarine activities during World War II, starting from the patrols just before the war began; the narrative extends to 1944, detailing their entire action plan, their daily lives, the constant pursuit of the enemy, their anxieties, and their decorations.