Finnish submarine AG 12 was a Russian submarine of Holland 602GF/602L type (AG = Amerikansky Golland), which served in the Gulf of Finland

Gulf of Finland

The Gulf of Finland is the easternmost arm of the Baltic Sea. It extends between Finland and Estonia all the way to Saint Petersburg in Russia, where the river Neva drains into it. Other major cities around the gulf include Helsinki and Tallinn...

 during the first World War.

During World War I Russian and British submarines operated from bases in Finland

British submarine flotilla in the Baltic

A British submarine flotilla operated in the Baltic Sea for three years during the First World War. The squadron of nine submarines was attached to the Russian Baltic Fleet. The main task of the flotilla was to prevent the import of iron ore from Sweden to Imperial Germany...

. The Russian submarines of Holland type (AG 11, AG 12, AG 15 and AG 16) were scuttled in the harbor of Hanko on April 3, just prior to the German landing there. These submarines had good sea going qualities and were easy to handle. When the German troops advanced on Helsinki

Helsinki

Helsinki is the capital and largest city in Finland. It is in the region of Uusimaa, located in southern Finland, on the shore of the Gulf of Finland, an arm of the Baltic Sea. The population of the city of Helsinki is , making it by far the most populous municipality in Finland. Helsinki is...

, the British submarine group sailed out and scuttled their submarines outside the city, on April 4, 1918. The Squadron consisted of the submarines E 1, E 8, E 9, E 19, C 26, C 27 and C 35. The British crews could return to Britain via Murmansk

Murmansk

Murmansk is a city and the administrative center of Murmansk Oblast, Russia. It serves as a seaport and is located in the extreme northwest part of Russia, on the Kola Bay, from the Barents Sea on the northern shore of the Kola Peninsula, not far from Russia's borders with Norway and Finland...

.

Two of the Russian subs, the AG 12 and the AG 16

Finnish submarine AG 16

AG 16 was a Russian submarine of Holland 602GF/602L type , which served in the Gulf of Finland during the First World War.During World War I Russian and British submarines operated from bases in Finland...

, seemed to be in relatively good shape and the Finns decided to lift them and to repair them. After salvaging, the AG 12 was transferred to Turku

Turku

Turku is a city situated on the southwest coast of Finland at the mouth of the Aura River. It is located in the region of Finland Proper. It is believed that Turku came into existence during the end of the 13th century which makes it the oldest city in Finland...

and the AG 16 to Helsinki. AG 12 was however a hopeless case and was soon scrapped.