Finnish submarine AG 12

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Class overview
Operators: Flag of Russia Imperial Russian Navy
Naval flag of Finland Finnish Navy
General characteristics
Type: AG type diesel powered submarine
Displacement: 390 tons surfaced
520 tons submerged
Length: 46.00 m
Beam: 4.9 m
Draught: 3.8 m
Speed: surface - 14.5 knots
submerged - 10.5 knots
Complement: 32
Armament: 4 × bow torpedo tubes
(8 torpedoes)
1 × 45 mm semi-automatic gun (200 rounds) or
1 × 47 mm gun
1 × machine gun

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

During WWI Russian and British submarines operated from bases in Finland. The Russian submarines of Holland type (AG 11, AG 12, AG 15 and AG 16) were scuttled in the harbor of Hankoo 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, 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.

Two of the Russian subs, the AG 12 and the AG 16, 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 and the AG 16 to Helsinki. AG 12 was however a hopeless case and was soon scrapped.

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