INS Sindhuratna (S59) is a Sindhughosh-class diesel-electric submarine of the Indian Navy. On 26 February 2014 smoke was detected on Indian Navy submarine INS Sindhuratna off Mumbai coast, and onboard 4-5 sailors were airlifted to a Mumbai hospital after they fell unconscious from suffocation. The senior-most submarine officer of the Western Naval Command was on board. 2 people were killed while 7 were injured. The cause of the fire remains unknown. As per reports, smoke had engulfed compartment No. 3 in the sailors’ accommodation area when the submarine was underwater during a training mission, leading to deaths and injuries.