Indian Navy Commissionned INS Chakra, Russia’s ex-Nerpa Akula II Nuclear Sub

The submarine’s displacement is 8,140/12,770 tons. Its maximum speed is 30 knots, maximum operating depth, 600 m; and endurance is 100 days with a crew of 73. The vessel is armed with four 533mm torpedo tubes and four 650mm torpedo tubes.

India has become the sixth operator of nuclear submarines in the world, after the United States, Russia, France, Britain and China, though it previously leased another Russian submarine which was then returned.

Twenty sailors died on the Nerpa in 2008 after the vessel’s fire-suppression systems were accidentally triggered during sea trials, releasing toxic gases.