At the outbreak of the war, at least 3 destroyers and 10 submarines were building, as well as a variety of small craft; and it is probable that the Leningrad yards are completing a few of these units, as well as refitting the Baltic Fleet whose base at Kronstadt has been heavily damaged. Submarine construction on a modest scale is proceeding at Molotovsk, and perhaps at Gorki. The former is important as it provides reinforcement for the Northern Fleet; output at the latter can still be passed down the Volga to the Caspian, and the small "M" class submarines could be sent complete by rail to Poti and Batum for the Black Sea Fleet.