INS Sindhughosh (S55) is the lead ship of her class of diesel-electric submarines of the Indian Navy. The submarine was commissioned in April 1986 in Riga, Latvia, Cdr. K.C Varghese in command. The submarine is diesel-powered and has a total of six motors. INS Sindhughosh was the first submarine in Indian Navy to be equipped with the Klub ZM-54E SS-N-27 antiship cruise missiles with a range of 220 kilometres (140 mi). The submarine has a displacement of nearly 3,100 tons when submerged, a maximum diving depth of 300 metres (980 ft), speed of up to 17 knots (31 km/h), and are able to operate solo for 45 days with a crew of 52.