Finnish submarine AG-16
 The Russian submarine AG-12 was an AG-class (AG = Amerikansky Golland) submarine which served in the Gulf of Finland during World War I. During the war Russian submarines operated from bases in Finland. AG-12 and three of her sisters were scuttled in Hanko harbor on 3 April 1918 just prior to the German landing there. AG-12 and AG-16 seemed to be in relatively good shape and the Finns decided to salvage them.