a Russian submarine minelayer.

The Krab was commissioned in July 1915 and was the first submarine minelayer in the history of shipbuilding. It had a displacement of 740 tons and an underwater speed of up to 13 km per hour (7 knots); it was armed with a 75-mm gun, two machine guns, and two minelaying units and had a crew of 50 men. In 1915 and 1916 it successfully performed minelaying operations in the regions of the Bosporus and Varna. The German light cruiser Breslau was blown up in 1915 by mines set by the Krab in the Bosporus. In 1919 the Krab was sunk by the interventionists near Sevastopol’.