Of the British U-class. Launched at Vickers Armstrong, Barrow 16 February 1938. Lent to the Russian navy as the B4 in the period 1944-1949. Sold in May 1950 to be broken up. Displacement 540/730 tons with dimensions 180 x 16 x 12 3/4. The engines delivered 615/825 hp allowing a speed of 11 25/10 knots. Armed with 6-21" torpedo tubes and 1-3" gun.
