First Indian indigenously built ballistic missile submarine (SSBN) INS Arihant recently completed its first deterrent patrol. A deterrent patrol is one where an SSBN, with the full complement of nuclear-tipped missiles, sails towards its intended area of deployment within the range of an adversary's targets. In case of an attack by a nuclear-armed adversary, the SSBN can be ordered to launch its weapons after receiving a coded signal from Indias nuclear command post. Watch the analysis of the successful completion of INS Arihant’s patrolling here.