SM UB-91


SM UB-91 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 11 April 1918 as SM UB-91.
On 4 October 1918 UB-91 sank the, killing among others, Yokohama Specie Bank sub-manager S. Ujie, his wife and three sons, together with bank employee Takashi Aoki and wife Sueko.

Surrender

UB-91 was surrendered to Britain on 21 November 1918 at Harwich. She toured the South Wales ports of Cardiff, Newport, Swansea, Port Talbot and was towed to Pembroke Dock, eventually being broken up in Briton Ferry in 1921. King George V presented her deck gun to Chepstow by in recognition of the bravery of William Charles Williams RN VC at Gallipoli in 1915.

Construction

She was built by AG Vulcan of Hamburg and following just under a year of construction, launched at Hamburg on 6 March 1918. UB-91 was commissioned later the same year. Like all Type UB III submarines, UB-91 carried 10 torpedoes and was armed with a deck gun. UB-91 would carry a crew of up to 3 officer and 31 men and had a cruising range of. UB-91 had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.

Summary of raiding history

Citations