Security ... think about it!
India on Monday became the world's sixth country after the US, Russia, France, the UK and China to operate nuclear-powered submarines when the Russian Akula-II class submarine `K-152 Nerpa' was commissioned into Indian Navy as INS Chakra on a 10-year lease under a secretive almost $1-billion contract inked in 2004.[indiatimes.com]
The Russian Strategic Nuclear Force is to get two new missile submarines this year. They are the “Yury Dolgoruky” and the “Alexander Nevsky”.[ruvr.ru]