SM UB-104 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 15 March 1918 as SM UB-104.

UB-104 was sunk by mine in at the Northern Barrage on 19 September 1918.

Construction

She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 1 September 1917. UB-104 was commissioned later the same year under the command of Oblt.z.S. Ernst Berlin. Like all Type UB III submarines, UB-104 carried 10 torpedoes and was armed with a deck gun. UB-104 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-104 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 DateNameNationalityTonnageTonnages are in gross register tonsFate2 August 1918Flevo X111Sunk2 August 1918Remke193Sunk3 August 1918Cambrai963Sunk13 August 1918Frida395Sunk13 August 1918Jönköping 11,546Sunk14 August 1918Wallsend2,697Sunk14 September 1918Gibel Hamam647Sunk15 September 1918Kendal Castle3,885Sunk16 September 1918Ethel2,336Sunk16 September 1918Lord Stewart1,445Sunk17 September 1918Ursa1,740Sunk

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