That's a long way to go and even if the launch of SSBNs is an important step for the deterrence against China, the prime focus now must be to improve the range of our sublaunched ballistic missiles!
Arihant will not deter China. See section on "Operational Capability" below.
INS Arihant SSBN - Indian Defense Projects Sentinel
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Harbor and Sea Trials
During harbor trials the submarine will be operated using external steam and power, instead of the steam and power generated using the onboard nuclear PWR. The crew will perform trim dives by pumping water in and out of its ballast tanks.
Following successful completion of harbor trials, the submarine's nuclear reactor will be made critical for sea trials and the submarine sailing under its own power. The initial focus will be on surface sailing and maneuvering at progressively increased speeds. Shallow dives will follow with diving depth being progressively increased.
The submarine will return to harbor following each dive to enable inspection of its hull.
The reactor will be powered up to its full 83 MWe capacity in phases and the submarine will be tested to its maximum depth.
Weapon trials will start on completion of the sea trials.
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Based on Russian Charlie II subs
India is reported to have acquired design of the Charlie II class nuclear submarines from Russia and the ATV was based on those designs. Along the way, in January 1988, India leased a Charlie class nuclear powered submarines from Russia to help the Navy familiarize itself with operating a nuclear submarine. The leased submarine was christened Chakra in the Indian Navy which operated it for three years. After the term of the lease ran out, the sub was returned to Russia.
The Arihant is 112m long as compared to 103m Charlie class subs, probably because of a section was added in the middle to accommodate its four missile tubes.
Its 10m beam is the same size as a Charlie class sub.
Like the Charlie II subs, Arihant has a single nuclear power plant which gives it a rather limited underwater speed of 24 kts. Not enough to chase warships or get away from them when it is detected.
During the launch of INS Arihant on Sunday, July 26, Prime Minister Manmohan Singh did not mince words while acknowledging Russia's role in the fruition of the challenging project.
"I would also like to express our appreciation to our Russian friends for their consistent and invaluable cooperation, which symbolizes the close strategic partnership that we enjoy with Russia," he said.
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Analysis
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It is likely India has sourced components like propellers and shafts from Russia for the boat to minimize risks.
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Operational Capability
The Sagarika's limited range of 700km makes it inadequate even as a deterrent against Pakistan, let alone China.
There have been misleading press reports that as a vital component of the India's credible minimum deterrent strategy, Arihant is designed to lurk in littoral waters of Pakistan and China to fire its very limited range nuclear missiles in case India comes under a nuclear attack. Nothing could be further from the truth.
It will be years, more likely decades, before the Navy acquires the confidence to send an Arihant class nuclear submarine close to the Chinese or even Pakistani mainland. At the very least the sub would need to repeatedly demonstrate its ability to operate under the sea for months without returning to base.
Arihant's limited underwater speed of 24 kts makes it incapable of running away from modern warships once detected. Nuclear subs tend to be noisy when operating at max speeds, Arihant will in all probability be very noisy.
As soon as the submarine is deployed on patrol its movement will be tracked by the Americans and possibly by the Chinese.
There isn't a boomer armed with nuclear missiles in the open oceans that isn't being tracked by America. Russian boomers that threaten America are essentially those that are lurking under the ice in the Arctic circle or in Russian coastal waters.
China has operated nuclear submarines for over 25 years now, but none of their submarines have ventured too far away from the Chinese mainland. Their subs are, however, equipped with missiles that can be launched at the US mainland from within Chinese waters.
The acknowledged range of the Sagarika missile, 700 km, is likely its range with a 500 kg warhead. With a lighter nuclear warhead it could conceivably go as far as 1500 km. Deployed in Indian territorial waters the Arihant can threaten Pakistan but not China.
Hopefully, DRDO will be ready with the Agni IIISL within a year or two which will give Indian Strategic Command the option to launch counter value nuclear strikes on mainland China from within Indian waters.
It could well be another 5 years before that capability is reached.
It could probably be a decade before an Arihant nuclear submarine leaves the Indian ocean.
It is likely that followup nuclear subs will accommodate more sections to carry at least 12 launch tubes instead of the four that the sub currently carries. They will need more powerful nuclear power plants to propel their greater weight and achieve speeds in excess of 30 kts
The ATV project appears to be well conceived and carefully calibrated. It has a good chance of succeeding despite past delays. Indian nuclear and missile technology is well developed and reasonably advanced, though DRDO's past record has not always been stellar."
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"Invaluable [Russian] cooperation"
INS Arihant - Wikipedia, the free encyclopedia
"In his address to the crowd,
Prime Minister Manmohan Singh billed the submarine as an outcome of a public-private partnership. He also thanked Russia in his address stating
"I would also like to express our appreciation to our Russian friends for their consistent and invaluable cooperation, which symbolizes the close strategic partnership that we enjoy with Russia".[15]"
http://zeenews.**********/news/nation/n-submarine-arihant-to-start-sea-trials-soon_745060.html
"INS Arihant was formally launched in July 2009 and it would be the first in the series of three nuclear-powered submarines that the country is
building with assistance from Russia."