 She was laid down by early 1916 at the Pola Navy Yard, and launched on 8 January 1917.After her completion, "U-28" was commissioned into the Austro-Hungarian Navy on 26 June 1917 under the command of "Linienschiffsleutnant" Zdenko Hudeček.Previously in command of , Hudeček was a 30-year-old native of Theresienstadt (present-day Terezín in the Czech Republic).