INS Sindhudhvaj (S56), a Soviet-designed EKM class of conventional submarines that are also known as Kilo was retired from the Indian Navy recently after completion of 35 years in service with the Indian Navy. INS Sindhudhvaj in over 3 decades has been part of multiple secret missions and multi-nation naval exercises but what this submarine might be remembered for is that it was the only submarine that was able to sink an American USS City of Corpus Christi (SSN-705), a Los Angeles-class submarine.

In the 2015 edition of the Naval exercise MALABAR, INS Sindhudhvaj was tasked to hunt and destroy the USS City of Corpus Christi (SSN-705) in a simulated battle. Both submarines being attack class submarines were tasked to hunt each other in the simulated battle in the Bay of Bengal but it was not an easy task as both submarines are known for being silent when operating undersea. Nuclear-powered attack submarine that can stay underwater for prolonged periods gives it a big advantage but a nuclear-powered submarine always makes more noise vis a conventional one.

Made in India’ Ushus SONAR (Sound Navigation and Ranging) that was newly equipped on the INS Sindhudhvaj was deployed for the first time to hunt SSN-705 and after a few hours in simulated battle, Ushus SONAR was able to detect the nuclear-powered submarine and managed to positively identify it and a simulated 533mm torpedos were launched at the location of the SSN-705 where it was detected and the kill was verified by a team of both Indian and American Naval observers, breaking radio silence the captain of the SSN-705 was informed that his submarine was sunk.

S56 not only was able to come within the torpedo range of SSN-705 but also managed to launch salvos of simulated torpedos without being detected by the crew of SSN-705. The simulation was called out when the Captain of the SSN-705 was informed that the hunt was over as S56 was able to manage to launch torpedos in the simulation and kill was granted.

Russia always had opposed the deployment of the Kilo-class submarines in Naval Exercise where Western Naval units were involved but for the first time, India used Russian-manufactured Kilo-class submarines and successfully sunk a nuclear attack submarine of American origin might have brought big simile on the Russian designers but they still very not happy that Indian Navy participated with them even after their objections.

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