 It caused the submarines to operate in a confined area near the shore in shallow waters, making them vulnerable to strong enemy anti-submarine forces.As a result, despite making a number of attempts, the submarines were unable to directly sink any enemy ships during the operation, although a mine placed by the "Żbik" did sink a German minesweeper.No Polish submarines were lost to enemy action, but they suffered progressive wear and tear, and technical problems, forcing the submarine commanders to break off their actions, effectively ending the operation by the middle of September 1939.