First full view of S4 SSBNs has emerged out on twitter. The submarine seems to be 20 meters long and has 8 launch tubes instead of 4 of the earlier two sister boats S2 (INS Arihant) and S3 (INS Arighat).
Four boats of this Arihant-class are planned. The first boat of the class, INS Arihant, was commissioned in August 2016.
The first four vessels are expected to be commissioned by 2025. In December 2014, the work on a second nuclear reactor began and the second boat, INS Arighat whose sea trials which started in 2017, is now completed and is scheduled to be commissioned in August, 2022 along with INS Vikrant.
The final two boats INS Aridhaman (S4) and S4* (codename) in the class are expected to be larger, displacing over 1,000 tons more than the Arihant and have 8 missile launch tubes to carry up to 8 K4 or K5 and a more powerful pressurized water reactor than INS Arihant. INS Aridhaman was launched in November 2021 and expected to be commission in 2024.
Here is the original unaltered image of the Submarines by ConflictX on twitter:
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