La Rochelle, France, 1941, a German submarine is leaving the harbor began its patrol in the Atlantic.
As the commander of the submarine, your job is to destroy the British transportation line by sinking their ships using torpedo and 88mm gun.
During the patrol, you may encounter some British destroyers as well. The destroyers are the most dangerous, they can destroy your u-boat by using its cannon or depth charge.
By diving deeper and lowering the speed, you may able to the chance been discovered by the destroyers. Diving deeper can also reduce the damage of the depth charges.
By listening to the sonar, you can locate the enemy ships even when the submarine has dived
Good luck, commander!