U20 20 Oct 1917

(Launched 18 Sep 1916) 17 Dec 1916 claimed as sunk by British drifter Fisher Girl on Otranto barrage but Austrian records show her to have been in port.

Struck by Admiral Spaun during trials 15 Mar 1917.

Torpedoed off Tagliamento estuary by Italian submarine F12 05 Jul 1918; all hands lost.

Raised in 1962, brought ashore at Grado and scrapped (some parts, including conning tower, acquired by Heeresgeschichtliches Museum, Wien).