SM UB-123
SM "UB-123" was a German Type UB III submarine or U-boat in the German Imperial Navy () during World War I. She was commissioned into the German Imperial Navy on 6 April 1918 as SM "UB-123". She torpedoed and sunk a vessel operated by the City of Dublin Steam Packet Company on 10 October 1918, shortly after the new parliamentary based German Government under Max von Baden had asked U.S. President Woodrow Wilson to negotiate an armistice. "Leinster" went down just outside Dublin Bay. Over 500 people perished in the sinking – the greatest single loss of life in  the Irish Sea. "UB-123" struck a mine at the North Sea Mine Barrage on 19 October 1918, all 36 crew members died in the event. Construction. She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 2 March 1918. "UB-123" was commissioned later the same year under the command of "Oblt.z.S." Robert Ramm. Like all Type UB III submarines, "UB-123" carried 10 torpedoes and was armed with a deck gun. "UB-123" would carry a crew of up to 3 officer and 31 men and had a cruising range of  . "UB-123" had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.