Submarine nine years stood at the dock waiting for repair enterprise. Extensive work on the modernization of "Kaluga" began the previous year.
Submarine was built in 1989 at the "reddish Sormovo" in Nizhny Novgorod project 877 "Halibut" ("Varshavyanka") to systematize NATO — "Kilo". At first Submarine came into the Black Sea Fleet, then it was moved to the North. DEPL "Kaluga"Designed to CDB for Marine Engineering" Rubin "in St. Petersburg. Such submarines have surface displacement of 2,300 tons, a length of 73 m, the speed submerged 18 knots (about 33 km / h), the complete autonomy of 45 days, dive depth of 300 meters, crew of 52 people. Its standard weapons — 6 torpedo tubes 533 mm.
"Star", which specializes in the repair and disposal of nuclear submarines, has extensive experience in the modernization of diesel submarines. Since 1997, the Severodvinsk shipyard for the Indian Navy has upgraded the stocks to own four Diesel-electric submarines and is working on the fifth submarine. The company also provides repair and modernization of similar submarine in her home — in the Indian port Vizakhapatnam.