INS Arihant: India nears completion of nuclear submarine ‘Slayer of Enemies’ – so what does it mean for the world?

India is conducting the final trials of its first nuclear-armed submarine, which would make it the sixth country in the world to possess a vessel capable of launching nuclear warheads from underwater.

When deployed, the submarine will complete India’s nuclear triad – allowing it to launch atomic weapons from land, sea and air.