 Complete the following phrase:  On 12 February 1915, five torpedo boats of the 9th Torpedo Boat Flotilla, including S32, were deployed to screen minesweeping operations near the Amrum Bank in the North Sea. When V25 did not return from this operation, a search found wreckage north of Helgoland. At the time it was believed that she had been sunk by a British submarine, with S32 claiming to have sighted a periscope, but in fact, no British submarines were in the vicinity, and V25 had probably been sunk by a British mine. All 79 of her crew were lost. On 23 March 1915, S32 took part in operations in the Baltic Sea off the coast of East Prussia and Lithuania, supporting a bombardment by German cruisers north of Memel. In August 1915, S32 took part in the 