 <unk> number of planned submarines remains unclear , according to media reports about three to six submarines are planned to be built . The first boat of the class , INS Arihant is expected to be commissioned by 2016 . The first four vessels are expected to be commissioned by <unk> . In December 2014 , the work on a second nuclear reactor began and the second boat , INS <unk> is being prepared for sea trials . The next three ships in the class , after the lead ship , will be larger and have 8 missile launch tubes to carry up to 8 <unk> and a more powerful pressurized water reactor than INS Arihant . A larger follow on class to the <unk> class is also planned , these new boats will be capable of carrying 12 to 16 ballistic missiles . 
