Between Spetember 1939 and May 1945 Germany launched over 1,000 U-boats into combat against the Allies. These submersible war machines prowled the stormy seas, striking without warning as deadly phantoms of the deep. As the commander of a U-boat you stalk the enemy in the icy waves of the North Atlantic in a battle where the hunter quickly becomes the hunted. Attempt to strangle shipping lanes and outmaneuver convoy escorts. React as technological advances, such as sonar and radar, wreak havoc with the mission of your submersible torpedo boat. Dive deep to avoid attacks from the sky. Measure your success in tonnage sunk. As the sounds of depth charges and twisting metal explode in your ears you will discover why the creators of Red Baron and Aces Over Europe consider this their best simulation ever.