The Koni class is the NATO reporting name for an anti-submarine warfarefrigate built by the Soviet Union. They were known in the Soviet Union as Project 1159. 14 were built in Zelenodolsk shipyard between 1975 and 1988. They were originally intended to replace the older Riga-class frigates, but were instead chosen as a design for export to various friendly navies. The Koni I sub class were designed for European waters and the Koni II were made for warmer waters. One was retained by the Soviets in the Black Sea for training foreign crews. Only a few of these vessels remain in service today.
In September 1996 a former Cuban Navy Koni II-class frigate designated 356 was scuttled in shallow water in Cayman Brac. This ship was built in 1984 as one of three Koni II-class frigates sold to Cuba to support its Cold War fleet. In 1996 the ship was purchased from Cuba by the Cayman Islands government to be scuttled in Cayman Brac as a dive attraction. The remaining two Cuban Koni II class were expended as targets. Frigate 356 was sunk upright, and initially her deck rested 90 ft (27 m) below the surface. A serious storm in 2004 broke the ship in two, and her bow now lists at a 45 degree angle, while her midships have become a debris field. Before being sunk the ship was renamed Captain Keith Tibbetts after a local politician and diver. It is one of only a few sunken Soviet Naval vessels in the Western Hemisphere, and the only one of two that is easily dived including her sister ship SKR-451.
On July 16, 1998 the former Cuban Navy Koni II-class frigate designated 353 was scuttled in shallow water near the Cuban resort town of Varadero in the Parque Submarino Cayo Piedra del Norte as an attraction for divers. It is rumored that Fidel Castro promoted the project, being an avid diver himself. The frigate sank upright, and sits on the sand bottom in 90 ft (27 m) of water. For an unknown reason her hull number was changed from 353 to 383 prior to the scuttling. The dive operators in the varadero area refer to the dive site as Patrol boat 383 or simply P.B even though it is a frigate.
Mourad Rais of Algerian National Navy in 1986. One of the warm-water export versions.
Soviet Union - 1 (to Bulgaria in 1990), Delfin was originally used for training foreign crews in the Black Sea, before being sold to the Bulgarian Navy, currently in service as Smeli (Bulgarian: Смели" ("Brave")).
Algeria - 3, in service, being upgraded with new electronics, ASW torpedo tubes and 8 x Kh-35 Uran/SS-N-25 Switchblade anti-ship missiles
Cuba - 3, 356 (No name) ex SKR-471 sunk as a reef , 353 (later 383) (Monkada or Moncada) ex SKR-451 sunk as a reef and 350 (Mariel) ex SKR 28 status unknown.
East Germany / Germany - 3, two scrapped in 1990 and one scrapped in 1995. (Rostock, Berlin - Hauptstadt der DDR, Halle)
Libya - 1 (formerly 2), 4 x 406mm torpedo tubes, status unknown, damaged by bombing May 19/20 and on August 9, 2011. (Al Ghardabia). The remaining ship, Al Hani captured by NTC in Benghazi, and has become the flagship of the reorganized Libyan Navy.
^Couhat Jean. Combat Fleets of the world 1982/1983 Their Ships, Aircraft, and Armament Paris: Editions Maritimes et d'Outre-Mer, 1981 ISBN 0-87021-125-0 Library of Congress Catalog Card Number: 78-50192 Pg.2