SM UB-18 [SEP] vessel class
SM UB-18
SM "UB-18" was a German Type UB II submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 30 April 1915 and launched on 21 August 1915. She was commissioned into the German Imperial Navy on 11 December 1915 as SM "UB-18". The submarine sank 126 ships in 31 patrols for a total of making her the 13th most successful U-boat in both world wars. "UB-18" was rammed by the trawler "Ben
SM UB-103
SM "UB-103" 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 18 December 1917 as SM "UB-103".
"UB-103" was sunk in the English Channel by British warships and "SSZ 1", a SSZ class blimp.
Construction.
She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 7 July 1917