SM U-55 was a German Type U-51 submarine built for the Imperial German Navy during World War I. Ordered from Germaniawerft in Kiel on August 23, 1914, she was laid down on December 28, 1914, and launched on March 18, 1916. The vessel was commissioned on June 8, 1916, under her first commander, Wilhelm Werner. U-55 was a significant asset in Germany’s naval warfare, participating in 14 patrols with the II Flotilla during her service. Constructed as a typical early 20th-century submarine, U-55’s wartime record was notable for her success in sinking enemy merchant vessels. She sank 61 ships totaling 126,010 GRT, damaged another seven ships for 26,161 GRT, and took two as prizes, totaling 3,466 GRT. Her most famous act was the sinking of the RMS Carpathia on July 17, 1918, off the east coast of Ireland. The Carpathia was renowned for rescuing Titanic survivors in 1912, making her loss a notable event. U-55 also sank the hospital ship HMHS Rewa on January 4, 1918. Throughout the war, command of U-55 changed hands, with Wilhelm Werner replaced by Alexander Weiss on August 10, 1918, and subsequently by Hans Friedrich on September 15, 1918. She remained in service until the armistice on November 11, 1918. Following the war, U-55 was surrendered to the Royal Navy at Harwich on November 26, 1918, and was later transferred to Japan. In 1920, she entered service with the Imperial Japanese Navy as O-3 until 1921. Subsequently, she was dismantled at the Sasebo Navy Yard between March and June 1921, although she briefly recommissioned in 1923 as Auxiliary Vessel No. 2538. U-55’s operational history, including her sinking of notable vessels and her transfer across navies, underscores her significance as a wartime asset and her contribution to early submarine warfare.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.