The first ship, BO-270, was built at Zelenodolsk in 1945-1947 and a total of 227 were built for Soviet Navy (175) and border guard until 1955.
submarine | Gym Class Heroes | class action | class | Class A | working class | nuclear submarine | Anti-submarine warfare | DB Class 218 | Class War | British Rail Class 37 | The Chaser | Social class | British Rail Class 47 | Victorian Railways X class | GWR 3031 Class | Class D | British Rail Class 66 | anti-submarine warfare | World Class Championship Wrestling | Saved by the Bell: The New Class | Nimitz-class aircraft carrier | Middle Class Rut | Middle class | middle class | Mercedes-Benz G-Class | Master Class | master class | LNER Class A4 4468 Mallard | First class travel |
Original SJD-3 sonar on earlier Type 037 class submarine chaser is replaced by a 13 kHz (2 frequency ranges) French Thomson Sintra SS-12/DIP 12 hull mounted (HM)/variable depth sonar (VDS).
Battleship 'B' was redesignated as Project 25 and given the task of destroying Treaty cruisers and German pocket battleships.
Special Base Force (Surabaya), 2nd Southern Expeditionary Fleet, Southwest Area Fleet.