S2 is a Tech Demonstrater. It is not going to go on Patrol Duties. Its purpose is to test K series of Missiles. After Agni VI (K5) is commissioned around 2020, S2 hull will be idle. The Arihant and Ardiman can be converted into SSGN (like Ohio Class) after the Arihant Follow on Class are ready for duty patrols only. It can be equipped with 12 VLS Cruise Missiles (Nirbhay and LRCM).