INS Arihant - India's first indigenous nuclear submarine completes first deterrence patrol. This marks the successful completion of India's nuclear triad (the capability to launch nuclear weapons from land, air and sea). INS Arihant can carry Sagarika / K 15 ballistic missiles which has a range of over 700 km. With this India becomes the sixth nation to possess nuclear triad. The other nations with nuclear triad include USA, Russia, China, France and UK.