class diesel electric submarine india fourth submarine commissioned december decommissioned february years service participated pakistani war played key role patrol missions later participated naval exercises nations goodwill visits countries preserved museum public access distinction submarine museums retain originality called visit destination despite decommissioned submarine receives navy dressing ship honour usually awarded active ships description length overall beam draught long tons surfaced long tons submerged maximum diving depth complement including officers sailors submarine shafts blade propeller powered diesel engines horsepower electric motors achieve maximum speed knots surface knots submerged knots range mph surfaced mph submerged torpedo tubes carry type torpedoes lay mines instead torpedoes band radar surface search operational history commissioned december soviet_union india fourth submarine commander commander began maiden voyage india february homecoming voyage lasted february april visited mauritius sister boat operational reported flag officer commanding chief western naval command ordered patrol approaches pakistan harbour established waiting stations submarine badly damaged collision destroyer surfaced directly ship drawings damaged portions boat available decided use docked bombay design template metal work repaired months time join pakistani war pakistan war pakistani war operated given patrol duties designated areas war started ordered operate restrictions cross shipping corridors attack target positive identification aims patrol sink pakistani naval warships sink merchant shipping specifically ordered conduct general patrol surveillance started home port november reached patrol location november remained november shifted new patrol location remained november november sea transfer instructions subsequently left bombay reached december patrols encountered fair weather monitored number commercial aircraft flying international routes originally intended lay mines plan later cancelled later service test firing torpedo laid years spare parts submarines underwent refit soviet_union september april operational ins participated anti submarine warfare training exercise victory singapore coast port blair february participated second exercise singapore ins visited singapore indonesia december good visit service years traversing nautical miles decommissioned february despite decommissioned submarine receives navy dressing ship honour usually awarded active ships museum ship present ship towed established museum ship submarine museum idea boat conversion museum credited admiral submarine metres final location took months cost million inaugurated chief minister august open public august retired naval personnel serve guides curator distinction submarine museums retain originality famous tourist attraction city called visit destination hindu million revenue generated year museum million submarine maintenance months museum operation visited people daily visitors usually range shoot tourist season september vice admiral united_states_navy visited submarine wrote fantastic experience proud awesome display said submarine preserved similar united_states major overhaul december repair hull new steel plates arranged cost million august million people visited museum visited people gallery
INS Kursura (S20)