The Indian Navy's Russian-made INS Sindhukirti, the seventh Sindhughosh class (Kilo-Class) diesel electric submarine is set to undergo final "full-power trials" after successful completion of its sea-trials. The submarine has been stuck in a refit for a decade at Hindustan Shipyard (HSL) and is expected to be formally handed over to the Navy next month. The cost of the retrofitting project at HSL is estimated at around Rs.700 crore. During the modernisation programme, the submarine received new weapons, sonars, and fire control systems. Currently, India’s conventional submarine fleet strength is precariously low at 13 vessels with only half of them being fully operational.