The sub appears to be a modified Akula design from all appearances,with a Borei(?) flavour in the configuration of the missile silos are abaft the sail.Given the stated chronology of the project and the fact that Russia gave us tech/design knowhow from the project's inception,it is most likely that it contains much that is in common wiht the Akula classes,with an Akula 2/3 (say some) arriving later this year.This would make sense as one of the stated objectives in acquiring the Akula is to train crews for the Arihant class SSBN.The 4 missile silo confguration ,each carrying three missiles,is similar to the USN's Ohio class ,ex-SSBNs,now converted into SSGNs,with each of its 16 silos carrying several (8?)Tomahawk LR cruise missiles for land attack,a huge arsenal.With the Arihant we seem to be doing the exact oppisite,where we are putting into each silo,3 smaller 750+km range ballistic missiles,later on to house a 5,000km class ICBM.This would make the sub similar to early model USN SSBNs which had Polaris and Poseidon missiles.By comparison,Chinese ICBMs aboard their Jin class have a range of 8,000km.The Arihant design is very versatile,as the sub can swing from the role of an SSGN to that of an SSBN,given the type of missiles carried,once sufficient numbers have been built.Once the first ATV has been comissioned,later versions could have a longer hull with an extra section for more missile silos (8+),to give our SSBNs a goodly quantity of LR ICBMs with their MIRVs to deal with all future threats.
The Russian ambassador was reportedly the guest of honour at the function and around 170+Russians associated with the project were also present.This indicates the very close cooperation between Russia and India over the project and Russia deserves a huge debt of gratitude as it has given India technology for the most important defence project of the country,that of an SSBN ,the most survivable leg of the N-triad to safeguard our strategic deterrent.When we add to this the SU30MKI,Brahmos,MIG-29K,Talwar FFGs,T-90s,Gorshkov,the ATV project and the arriving Akula SSGN,we can clearly see that NO other nation on the planet has assisted India in its endeavour to build a strong armed forces and assist our indigenous efforts.Hats off to Russia and further Indo-Russian defence cooperation!
PS:I posted in the Intnl. naval thread details of China resurrecting an old Golf class SSB and modernising it .This is very intriguing,as China has developed new SSBNs of the Jin class,two in service and three more expected shortly,carrying an 8,000km ICBM.It also has an older Xia class SSBN still in service.China earlier used the Golf class for missile tests.However,there might be another explanation.Pak is now going to be in an inferior position vis-a-vis India,without having a third leg of the nuclear triad .Its conventional subs can launch missiles from their tubes,anti-ship Harpoons and Exocets,while India is modifying all its Kilos for the same purpose to launch Klub missiles.But neither of these types can carry a worthwhile N-warhead with a suitable range.Therefore,China might be assisting Pak to give it/lease it a Golf which even though has only 3 ballistic missiles,would give it the experience of an SSB.The PN also does not need as did China,to send any of its SSBNs far out to sea,preferring them to remain close to its shore bases,or in the bases themselves,where they can be heavily protected from attack.The Paki military will be desperate to try and find an answer to the Arihant and Akula and this might be the "poor man's" way of an interim solution,as it does not have the domestic N-tech for such an expensive and sophisticated project,plus as all its missiles are of Chinese and NoKo origin.Thus,China transferring a Golf + a missile to go with it is a distinct possibility to aid its chief proxy in the campaign against India.Watch this space!