 Exact 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 2023 . In December 2014 , the work on a second nuclear reactor began and the second boat , INS Aridhaman 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 K4 and a more powerful pressurized water reactor than INS Arihant . A larger follow on class to the arihant class is also planned , these new boats will be capable of carrying 12 to 16 ballistic missiles . 
 Exact number of planned submarines <a href='uninflect' title='1'><mark>remains</mark></a> 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 2023 . In December 2014 , the work on a second nuclear reactor began and the second boat , INS Aridhaman is being prepared for sea trials . The next three ships in the class , after the lead ship , will be larger and <a href='got' title='2'><mark>have</mark></a> 8 missile launch tubes to carry up to 8 K4 and a more powerful pressurized water reactor than INS Arihant . A larger follow on class to the arihant class is also planned , these new boats will be capable of carrying 12 to 16 ballistic missiles . 
Exact number of planned submarines remain unclear , according to media reports about three to six submarines are planned to b built . da first boat of the class , INS Arihant is expected to bbcommissioned by 2016 . The first four vessels are expected to bebommissioned by 2023 . In December 2014 , tdawork on a second nuclear reactor began and the second boat , INS Aridhaman is being prepared for sea trials . Thdaext three ships in thedaass , after the lead ship , gon be brger and got 8 missile launch tubes to carry up to 8 K4 and a more powerful pressurized water reactor den INS Arihant . A larger follow on class to the dahant class is also planned , dese new boats will be cbable of carrying 12 to 16 ballistic missiles .