 U @-@ 3 was built as part of a plan by the Austro @-@ Hungarian Navy to competitively evaluate foreign submarine designs from Simon Lake , Germaniawerft , and John Philip Holland . The Austro @-@ Hungarian Navy authorized the construction of U @-@ 3 ( and sister ship , U @-@ 4 ) in 1906 by Germaniawerft of Kiel , Germany . U @-@ 3 was laid down on 12 March 1907 and launched on 20 August 1908 . After completion , she was towed via Gibraltar to Pola , where she arrived on 24 January 1909 . 
