Showing posts with label Akula. Show all posts
Showing posts with label Akula. Show all posts

November 29, 2013

Asia's Gradual Submarine Race


The first of six Russian built Kilo 636 subs for the Vietnamese Navy delivered to Vietnam in November 2013, 2,350 tons surfaced-4,000 tons submerged but no AIP.
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 for the US Navy Institute has written a fairly comprehensive article:
 http://news.usni.org/2013/11/13/asias-submarine-race of November 13, 2013 concerning Asia's steadily developing submarine race.

"Asia’s Submarine Race"   
               

"Last week’s delivery of the improved Kilo-class submarine Ha Noi to the government of Vietnam was just the latest undersea-vessel acquisition of Asian navies. Asia is in the midst of a submarine buying spree, with most of the major powers planning substantial fleet increases over the next two decades. Two countries, Malaysia and Vietnam, have recently acquired their first submarines while a third, Thailand, is pushing to purchase its first submarines in the near future.

The trend to submarines reflects the desire of Asian countries to protect their recently acquired wealth and enduring economic interests. Much of Asia is dependent on open sea lanes to keep export-driven economies humming, and a recognition of the importance of sea power is driving a general naval expansion throughout the region.
Another, more ominous driver is the recent uptick in territorial disputes in Asian littorals, particularly those driven by China. China’s claim of the so-called “Cow’s Tongue” in the South China Sea brings it into conflict with the territorial claims of Taiwan, the Philippines, Vietnam, Malaysia, and Brunei. Meanwhile the Senkaku/Diaoyu islands in the East China Sea are claimed by China, Japan and Taiwan.
China
Fueled by a strong economy, the Chinese navy is making strides in development of a multifaceted
submarine force. One goal of Chinese submarines is to create an anti-access/area denial zone up to what it refers to as the First Island Chain, consisting of the Kuril Islands, Japan, Taiwan, and the South China Sea. The chain represents the absolute minimum to defend the Chinese mainland.
The second goal would be to enforce China’s claims on the East and South China Seas. Patrols and presence missions in the waters surrounding those areas would help press these claims.
The Chinese navy is replacing the single Xia-class (092) ballistic missile submarine with up to six modern Jin-class (094) ballistic missile submarines. Each Jin-class displaces 9,000 tons submerged and is equipped with a dozen JL-2 submarine-launched ballistic missiles. The JL-2 is estimated to have a range of 7,200 kilometers (4,475 miles) and capable of carrying up to eight nuclear warheads.
The three submarines of the Shang class (093) represent the second generation of Chinese nuclear attack submarines, the previous Han class having been a technical disappointment. Displacing 6,000 tons submerged, the Shang class features six bow-mounted 533mm torpedo tubes. Built with Russian assistance, only three ships were produced, suggesting the class was less than successful. Yet another class (095) is believed to be under development.
China also operates a range of diesel electric submarines. Nine submarines of the Yuan class (041) and the 14 of the smaller Song class (039) represent the indigenously produced fleet. Yuan-class ships displace up to 2,400 tons submerged, while the slightly smaller Song boats rate 2,200 tons submerged. Both are equipped with six bow-mounted 533mm torpedo tubes.
China also operates ten improved Kilo submarines purchased from Russia, and earlier this year placed an order for another four Lada-class subs. That latest order, despite production of the Yuan class, suggests dissatisfaction with the performance of the latter.
Russia
The Russian Pacific Fleet reflects the decline of the former Soviet navy’s submarine forces, even more so than the rest of the Russian navy. All of the submarines of the Pacific Fleet were built in the 20th century, with a good number constructed in the 1980s.
Four Borey-class ballistic missile submarines will be assigned to the Pacific Fleet in the future, replacing the fleet’s single Delta III submarine. Submarines of the Borey class displace 19,400 tons submerged and are equipped with six 533mm bow-mounted torpedo tubes and 16 SS-N-32 Bulava submarine-launched ballistic missiles. Development of the Bulava has been problematic, with nearly half of test launches ending in failure.
Four Oscar-class guided-missile submarines serve with the Pacific Fleet. Each displaces 14,500 tons submerged and carries 24 SS-N-19 anti-ship missiles. Torpedo armament is in the form of four 533mm and four 650mm bow-mounted torpedo tubes capable of firing SS-N-16 Stallion and SS-N-15 Starfish anti-submarine missiles, guided torpedoes, and Shkval supercavitating torpedoes.
The bulk of the Pacific Fleet’s submarine force lies in its attack submarines—four nuclear powered Akula-I, each displacing more than 8,000 tons submerged. Armament consists of four 533mm and four 650mm bow-mounted torpedo tubes, capable of launching SS-N-21 Sampson land-attack missiles, SS-N-15 anti-submarine missiles, torpedoes, and mines.
Finally, there are seven Kilo-class diesel-electric submarines, including three improved Kilo submarines. The Kilo-class displaces 3,100 tons submerged, and features six 533mm torpedo tubes capable of launching either SS-N-15s or torpedoes. The ship can alternately carry up to 24 mines, or a mixture thereof.
India

India’s submarine fleet, which faces both Pakistan and China, is in an increasingly precarious position. Indian submarines are growing older as plans to replace them become tangled in bureaucratic red tape, and both of India’s potential enemies’ submarine fleets grow larger and increasingly sophisticated.
India has launched its first ballistic missile submarines, the Arihant. [Possibly] Based on the Russian Akula nuclear attack submarine design, the Arihant-class features a 10-meter plug to accommodate four vertical launch silos equipped with K-15 Sagarika ballistic missiles. The 6,500-ton submerged submarine also features six 533mm torpedo tubes capable of launching torpedoes or Klub anti-ship missiles. At least three Arihant-class submarines are projected.
India also retains one Akula-1 submarine, INS Chakra, in conventional attack submarine configuration. Displacing 9,100 tons submerged, torpedo armament is identical to the Arihant class. Originally built for the Russian navy as the Nerpa, it suffered from quality control problems and a 15-year construction period. The ship is currently on a ten-year lease to India.
In addition to nuclear submarines, India operates a fleet of ten Kilo-class Russian submarines, the oldest of which is 30 years old. One submarine, Sindhurakshak, exploded in port earlier this year and was a total loss. A plan to build six submarines of the Scorpene class—1,700 ton ships equipped with torpedoes and Exocet missiles—has been repeatedly delayed because of bureaucratic and technical problems.
Pakistan
Pakistan’s sole adversary at sea is India. Pakistan maintains five submarines of the French Agosta class: two are of the original Agosta class built in the 1970s, while the other three are of the modernized Agosta 90B class. The three Agosta 90B submarines displace between 1,760 and 2,010 tons submerged, are equipped with four 533mm bow-mounted torpedo tubes capable of firing torpedoes and Exocet missiles. By 2014 all three will feature an air-independent propulsion system, making them among the most sophisticated submarines in Asia.
Japan
Japan recently declared an intent to boost its submarine fleet from 16 to 22 ships. Production of the Soryu-class diesel electric submarines continues with last week’s launch of Kokuryu (“Black Dragon”). Eight Soryu-class submarines will be built, the last of which was laid down this year. At 4,200 tons submerged, the Soryu class is one of the few regional submarines to feature air independent propulsion, technology acquired from Sweden. Armament is in the form of six 533mm torpedo tubes capable of launching Type 89 homing torpedoes and Sub Harpoon missiles.
Rounding out Japan’s submarine fleet are the 11 submarines of the Oyashio class. At 3,600 tons submerged, armament is identical to that of the Soryu class. It is not clear how Japan intends to grow its submarine fleet, but for the near future that fleet will likely include the Soryu class, the Oyashio class, and the three remaining ships of the Harushio class, 2,750 ton ships with armament identical to the other classes. The oldest Harushio submarine is only 19 years old, the average age at which Japanese subs are retired, but a time when diesel electric submarines in other navies are usually still in service.
Japan’s submarine fleet will increase its ability to create an anti-access / area denial force of its own. The Chinese Navy has regularly sortied through the Miyako Strait, the shortest route between the Eastern Fleet’s headquarters and the Western Pacific. Japanese submarines, backed up by surface and air assets, would make Chinese transit of the straits a difficult proposition.
Australia
Australia’s submarine force lies in the six ships of the Collins class. At 3,300 tons submerged, the ships are theoretically some of the most advanced diesel-electric submarines in existence, with advanced sensors and excellent performance submerged. Six bow-mounted torpedo tubes are capable of firing U.S. Mk-48 ADCAP torpedoes and Sub Harpoon anti-ship missiles.
The Collins class has been beset with problems since the lead ship entered service. Software problems, hydrodynamic flow problems, cracked propellers, engine and gearbox seal problems, and periscope vibration have all contributed to a low operational readiness rate for the submarines. At one point in 2009 only one submarine, HMAS Farncomb, was rated capable of sea duty. That is expected to improve to four submarines capable of sea duty by early 2014.
In 2009 the Australian government called for replacing the six ships of the Collins class with a dozen submarines of an advanced design. The new design likely will be either an evolution of the Collins design or something new, and will be built in Australian shipyards. In the meantime the Collins class will continue to serve, with upgrades, until at least 2030.
Singapore
Sitting astride the southern approach to the Strait of Malacca, Singapore is in close proximity to one of the most important shipping lanes in the world. Singapore has two submarines of the Archer class, submarines originally built for the Swedish navy. Although up to 25 years old, the Archer class was extensively refitted, including the addition of air-independent auxiliary engines. Each Archer class submarine displaces 1,600 tons submerged and has six bow-mounted 533mm torpedo tubes and three bow-mounted 400mm torpedo tubes. The ships also are capable of carrying up to 22 mines in external portable containers.
Singapore additionally has four submarines of the Centurion class. Also Swedish in origin, the Centurion boats were built in the late 1960s but remain in excellent condition when retired. At 1,400 tons submerged, each packs four 533mm and two 400mm bow-mounted torpedo tubes.
North Korea
The North Korean economy did not adjust well to the fall of the Soviet Union, and its navy, the service with the lowest priority in terms of resources, has particularly undergone hard times. Since then North Korea has begun constructing submarines of less than 500 tons, one of which sank the Republic of Korea Navy corvette Cheonan in 2010.
Originally the mainstay of the North Korean submarine force, the 20 Soviet-designed, Chinese-built Romeo-class diesel electric submarines are slowly being phased out in favor of the Sang-O class of coastal submarines. Up to 40 Sang-O-class ships have been produced. The Sang-O class displaces 325 tons submerged, is equipped with four 533mm torpedo tubes, and can carry up to 16 mines. At least some ships of the class are unarmed infiltration submarines designed to ferry North Korean special forces. A lengthened version, the K-300, was identified in 2011.
North Korea also operates up to 10 midget submarines of the Yono class. At 130 tons submerged, featuring two 533mm torpedo tubes, it is believed to be the type of submarine responsible for the sinking of South Korean Cheonan.
South Korea
Like the rest of the Republic of Korea Navy, the submarine force is in a period of expansion and is expected to double over the next 20 years. The current force consists of nine Type 209 submarines, built in both Germany and South Korea. The Type 209s displace 1,300 tons submerged and are equipped with four bow-mounted 533mm torpedo tubes capable of firing torpedoes and laying mines. Some ships in the class are capable of firing Sub Harpoon.
In addition to the Type 209s, a force of nine Type 214 submarines is also under construction, with three completed. At 1,800 tons submerged the 214s are heavier than their predecessors and carry twice as many torpedo tubes, all of which will be capable of firing Sub Harpoon.
A future submarine program, KSX-III, envisions nine submarines of 3,000 tons entering service around 2020.
Taiwan
Taiwan has four aging diesel-electric submarines — the oldest of which are of World War II vintage. Taiwan for some time has expressed a desire to find a replacement, but has been unable to find submarine producing countries that are willing to defy Chinese political pressure. The only potential provider of submarines, the United States, does not build diesel-electric submarines.
Vietnam
In April 2009 Vietnam signed a deal with Russia for six new so-called “Improved Kilo” (Project 636) submarines for $1.8 billion. The six diesel electric submarines will be the first Vietnamese submarines in service. Displacing 4,000 tons submerged, the Ha Noi class mounts six 533mm torpedo tubes capable of launching torpedoes or SS-N-27 (“Klub”) anti-ship missiles. The first of the six submarines, Ha Noi, was delivered to Vietnam on 7 November. The last of the boats is scheduled for delivery by 2016. Up to 50 mines may be carried as an alternative to torpedoes and missiles, an important area-denial capability.
Indonesia
The Indonesian navy’s submarine inventory currently consists of two aging submarines of the German Type 209 class, Cakra and Naggala. The submarines displace 1,400 tons submerged, have eight bow mounted torpedo tubes, and the option to lay mines. Both are over 30 years old and despite repeated refits are currently out of service awaiting upgrades. Daewoo of South Korea was contracted to modernize Cakra, which was supposed to be completed by 2013.
Indonesia’s Defense Strategic Plan 2024 calls for a fivefold increase in the number of submarines over the next 11 years. Toward that end Indonesia has ordered three modified Type 209 submarines, to be built in both South Korea and Indonesia. The 1,600 ton vessels will feature eight 533mm torpedo tubes, capable of launching a mixture of torpedoes and mines. The submarines will begin entering service in 2015, with all three completed by 2018.
Malaysia
Malaysia recently completed purchase of its first two submarines, the Scorpene-class vessels Tunku Abdul Rahman, and Tun Razak. At 1,740 tons submerged, the submarines have six 533mm torpedo tubes, capable of firing Black Shark homing torpedoes and Exocet anti-ship missiles. The submarines are not fitted with an air-independent propulsion system, but the boat’s design makes an option for future installation.
The submarines were built by the French defense contractor DCNS and Spain’s Navantia. Tunku Abdul Rahman had problems early on with her cooling system and was unable to dive, but those issues are thought to have been solved. The two submarines were purchased, along with training, for $1.1 billion. Crews for the submarines were trained locally, on board the retired French navy submarine Quessant.
Thailand
Thailand does not own any submarines, but it is laying the groundwork for a future fleet. A submarine fleet headquarters at Sattahip Naval Base will be completed in 2014. Thailand has sent officers to attend submarine training in Germany and South Korea, and will also soon complete construction of a Submarine Command Team Trainer. The Thai Ministry of Defense proposed purchasing six used Type 209 submarines from Germany in 2011, but the sale was canceled."

July 5, 2013

2025 before India could lease Chakra III nuclear submarine

 
INS Chakra ("II") (rebuilt using Indian money) when handed over to India (in 2012) for ten year lease. Chakra III would look very similar but would only be leased by India around 2025 if India and Russia rapidly agreed on its re-building. 
For several years the Indian Government has been considering leasing "Chakra III" a second derivative of the Akula nuclear propelled attack submarine.  Chakra III would supplement INS Chakra (the Akula derivative India leased last year). 
 
As new Akulas are no longer in production (in Russia's Amur and Sevmash Shipyards) India would be looking to have an existing Akula hull to be rebuilt. India and Russian focus appears to be on the Iribis Akula hull, which is sitting in Russia's Amur Shipyard.
 
India would also consider buying a rebuilt existing hull (Iribis) less expensive and less politically problematic than buying a new build Russian submarine such as the Yasen. Russia might also be reluctant to sell its latest attack submarines to India - in part due to the risk that the West (including the US) and China might get too good an opportunity to examine a completely new Russian submarine.
 
Iribis was laid down for the Russian Navy in 1994, but due to lack of Russian money (and altered post Cold War strategic requirements) Iribis was only 60% complete when work was stopped. As Iribis was never launched it would be sitting on stocks - probably in poor shape.
 
Once, or if, India and Russia do agree to use the Indian money that would be essential in the rebuilding of Iribis there would be at least a 10 year delay - perhaps until 2025 - before Iribis is ready for India to lease.
 

"India may take another n-sub on lease

India has expressed interest in leasing another nuclear attack submarine from Russia to supplement the Akula class hunter-killer that was inducted last year and the two sides are now ready to start negotiations on the project, the head of the top Russian design bureau for nuclear submarines has said.

Tentatively christened INS Chakra III, the new submarine will be a variant of the Akula class of stealthy nuclear-powered submarines that are capable of spending months under water but is likely to be equipped with more lethal weaponry, including a vertically launched Brahmos missile system.

If the project goes through, this would be the third Russian nuclear submarine to be operated by India. The first being the original INS Chakra that was taken on a three-year lease in 1988 and the second was inducted last year after a four-year delay. It too has been named the INS Chakra.

Vladimir Dorofeev, head of the [Russian] Malachite Design Bureau, which is the main centre for nuclear attack submarines in Russia, has said that the negotiations that India and Russia did during the 2012 lease of the Chakra would help in a smooth process for the acquisition of the new submarine. He also told The Indian Express that India has expressed an interest in acquiring the submarine and both the Russian design bureau and the shipyard that will construct it are ready for negotiations.

The submarine is likely to be reconstructed round the hull of the Iribis, a Russian Akula class submarine that was never completed as funds ran dry after the collapse of the Soviet Union. Dorofeev said that the new submarine could also benefit from the design efforts that Russia had put in its latest class of Yasen nuclear-powered attack submarines.

"The fourth generation of Yasen class submarine has been tested successfully, including the firing of a cruise missile from the submerged vessel. We can use that experience for the second Indian submarine. The launch was done using a new vertical launch system that can be used for the next submarine," Dorofeev said

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From http://www.island.lk/index.php?page_cat=article-details&page=article-details&code_title=82793 "

[Further details on the proposed Chakra III] The universal [vertical] launch system that has been tested can launch several types of missiles from a submerged vessel and can carry four to five missiles per salvo. However, [Vladimir Dorofeev, head of the Russian Malachite Design Bureau] refused to go into details of the project, saying that technical requirements for the next submarine will be discussed after India comes up with a set of technical requirements.

"If a political decision is taken then we as an industry should have no difficulty in delivering what is agreed to," he said. He expressed confidence that the matter will be discussed in future talks between Russian President Vladimir Putin and Prime Minister Dr Manmohan Singh, who meet once a year [maybe in Dec 2013 based on last year's schedule] for top level confabulations.

He, however, refused to comment on Russian assistance for the indigenous INS Arihant class of submarines that India is constructing in Vizag (Andhra Pradesh). Joint cooperation or technology sharing would depend on political negotiations between the two nations, he said.

In April 2012, the Eastern Fleet that is tasked with patrolling some of the most sensitive waters around India, formally inducted the INS Chakra, a stealthy nuclear-powered submarine acquired from Russia on a 10-year lease.

The Akula II class submarine — renowned as one of the stealthiest in the world is an attack submarine — is nuclear-powered but does not carry nuclear missiles on board [Pete's Comment - but nuclear tipped Klub cruise missiles could be fired through the horizontal torpedo tubes...]."

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In other Indian submarine news http://blogs.ottawacitizen.com/2013/06/15/india-faces-delays-with-new-submarines/ :

"The Indian Navy’s efforts to update its 1980s-era submarine fleet – aside from one semi-refurbished Akula nuclear submarine [INS Chakra "II"] on lease from Russia – is encountering significant bureaucratic delays, according to the Times of India. The plan to buy six French-designed Scorpene diesel-electric attack submarines, which was approved by India’s government in September 2005, has been delayed by problems attributed to the challenges of technology transfers, with the first boat now scheduled to be in the water in November 2016 at the earliest.

Meanwhile, the Finance Ministry has returned the Project-75I [mainly looking at additional AIP Scorpenes or HDW 214s] next-generation submarine file to the Defence Ministry for “clarifications”, delaying that program by at least three years."
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Pete

July 28, 2009

INS Arihant Launched July 26, 2009

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The most complete photo(?) image (above) of Arihant to date. Courtesy of India Today.
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The slide (above) depicts insides of the Arihant. It is from an Indian Department of Atomic Energy (DAE) powerpoint presentation reproduced by Indian NDTV and other media outlets.

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Though launched on July 26, 2009 the complete shape of Arihant still appears to be classified (based on the heavy restrictions on photos permitted).
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There has been much speculation over the last two years about the size and design of India's Advanced Technology Vessel (ATV) nuclear sub program. Now the "launching" of the Arihant indicates that the weapons fit is as expected (K-15 then Agni III (K-4)). Early reports were of a Russian Charlie sized ATV 4 - 5,000+ tons. Puzzling and perhaps a pointer to the smaller vessel (for 3 vessels at least) was the 80 MW reactor reported all along. As it turns out India is planning to buld three Arihant Class then two larger SSBNs (carrying 12 Agni IIIs?) perhaps of the Akula II size?. So all in all I suspect our theories were mostly right ;)
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India's first locally built nuclear submarine (Arihant is Sanskrit for "Slayer of Enemies") was launched on July 26, 2009 at the Naval Dockyard at Visakhapatnam on India's east coast. The hull is complete. The boat is floating. The reactor will be started soon - Indian sources report. The Indian Navy is being rather cautious with their new boat. One report claims the Navy didn't want a media launch but were overruled by the Prime Minister's Office since the PM was under attack for perceived concessions to Pakistan and needed to burnish his national security credentials.
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The media were not allowed to take photos and they only saw Arihant after it was floated (thus hiding a good portion of the hull (sonar, prop ?) under water. Arihant is being built in a semi enclosed dock to keep it out of view of overhead satellites.
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The submarine is 110 meter long with an eventual crew of 70-100 men. For its first 3 years of trials 10-20 technicians (mainly Indians but some Russians) are likely to be onboard.
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Once designated the ATV, INS Arihant is the lead vessel of the class. The second and third submarines of the Arihant Class are due to be launched in 2010 and 2011. The three submarines of the class may be in commission with the Indian Navy by 2015-18.
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Development
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The ATV project started with the intent to design nuclear-powered fast attack submarines (SSNs). As nuclear armed nations placed greater reliance on the sea leg (SSBNs) of the nuclear triad and less on the more vulnerable air (bombers) and land legs (fixed silos and mobile launchers) India altered the course of the project towards producing SSBNs.
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The Plutonium Recyling Project (PRP) at the Indira Gandhi Centre for Atomic Research (IGCAR) Kalpakkam was a cover name behind which BARC, a facility of the Department of Atomic Energy (DAE), built India’s first indigenous submarine Pressurised Water Reactor (PWR). This submarine reactor is in the so called "half boat" hull DAE built for testing prior to building the actual submarine (the Arihant) with an identical reactor. Both the land-test and reactor fitted in Arihant generate around 80 MW, powered by 40% enriched uranium. The relatively low HEU of 40% suggests regular refueling (every 10 years?) might be necessary. The Rare Materials Project (RMP) at Ratnahalli near Mysore, another DAE facility, produced the enriched uranium.
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The initial version of the land-test reactor ran into technical obstacles and delay after which Russian help was sought to resolve the design glitches during the early 2000s. Significantly Indian Prime Minister Singh at the July 26, 2009, launch thanked “our Russian friends for their consistent and invaluable cooperation, which symbolises the close strategic partnership that we enjoy with Russia”.
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The hulls for this class are built by L&T's Hazira shipbuilding facility in the state of Gujarat, northwestern India. . Tata Power built the control systems for the submarine. The systems for the steam turbine integrated with the PWR are supplied by Walchandnagar Industries.
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Future Weapons Fit
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The Arihant class may possibly be first armed with the BrahMos supersonic cruise missile but more likely it will have 4 tubes, each holding 3 x K-15 "Sagarika" SLBMs, see LAUNCHING PLATFORMS FOR PROJECT K-15 - so the Arihant may first field 12 K-15s. Then eventually one "K-X" SLBM per tube. The K-X is a version under development of the Agni-III IRBM. (hereinafter called the naval Agni III) - so four naval Agni IIIs per Arihant sub.
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The K-15s will be fired from under water. After the cold launch phase a booster will kick with one or more stages raising it to a 20 km altitude followed by a parabolic path to a target up to 750km distant. The K-15 missiles, developed by the DRDO, are already under production. The DRDO has test-fired them several times from submerged pontoons off the coast of Visakhapatnam. They can carry both conventional and nuclear warheads. They are 10.4 metres tall and weigh 6.3 tonnes each. Their warheads weigh about a 1,000 kg.

The 750 km range K-15 is an interim weapon (vastly shorter range, less throw weight than the Chinese SLBM JL-2) on the way to the naval Agni III). It is the naval Agni III which may be equivalent to the JL-2 but an Arihant will only have 4 naval Agni IIIs.
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This unique ability of a nuclear submarine to completely conceal itself underwater for up to 6 months will make it the most potent leg in in the nuclear triad. This is especially important given India's declared (though to date theoretical) no-first-use nuclear doctrine (which apparently does not apply to Pakistan). The nuclear submarine will provide a lethal second-strike capability to retaliate against a conceivable first preemptive strike by an enemy (mainly China).
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The Arihant class hull features twin flank-array sonars and Rafael broadband expendable anti-torpedo countermeasures.
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After launching of the 3 Arihant Class subs Indian planners envisage development of two SSBN size submarines - probably of similar size (12,000 ton) and design to the Akula II that India is due to lease from Russia early next year.
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Why has Arihant been officially unveiled now, in such an incomplete condition? Perhaps due to:

- national pride

- the Navy had to show it was getting somewhere. The need of the Indian Navy and weapons development organisations to show the public and politicians where the huge amount of development money, man hours and other resources have gone. Although the submarines were first envisaged in the 1970s ongoing problems, mainly with the reactor, have lead to delays.

- the Indian PM was under attack for perceived concessions to Pakistan and needed to burnish his national security credentials.

- a means of indicating great power status. Only the five permanent members of the UN Security Council (P5) have been able (or permitted) to develop and build nuclear submarines - that is the United States, RussiaFranceBritainChina. India has now forced its way into the nuclear sub owning club on the way to its broader campaign of achieving (P6) membership.

- the India-U.S. nuclear deal represents de facto recognition of India’s nuclear weapons program. This makes the unveiling at this time of a nuclear submarine that will be nuclear armed less politically sensitive.

- probably the most important reason to unveil now is to give the appearance of keeping up with China - to a limited extent. Arihant is a clear sign that India is looking to meet the future regional naval threat from China. The Chinese fleet of 62 submarines, with at least 10 of them nuclear-powered, is on the way to fielding the new JL-2 SLBM.
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The Chinese JL-2 missile has a strike range of over 7,200 km. When fired by Jin SSBNs from protected Chinese waters (the Jins need protection from highly active US anti-submarine forces) a JL-2 is capable of reaching India and Australia (including Perth and Brisbane). The required range would be 12,000 km to hit the continental US from Chinese protected waters around the SSBN base at Sanya, on Hainan Island, China.
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Some Extra Points
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It seems the DAE ran a facility called "Plutonium Recycling Project" that had nothing to do with Plutonium or recycling. With the Arihant launch, they threw open the doors of a facility restricted even to other DAE scientists and let the media take photos. They toured the "half boat" reactor and interviewed Anil Kakodar who stated they were able to build reactors to power future aircraft carriers if the Indian government so requested.
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The sub design is interesting. Nothing like the Charlie class. In the early 90s, India built two German HDW209 subs at Mazagon docks in Bombay and studied plans for the Project 75 Scorpenes. I think they learned quite a lot from those western boats. There is also a Russian Kilo that has been undergoing mid life refit for half a decade just meters away from the facility where the ATV was assembled. It has been literally cut open. Some speculate that the delay in refit was actually for training ATV-Arihant workmen.
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The limber slots and sail mounted planes don't look anything like the Akula (of the coming Nerpa/Chakra). Yet the Russian Ambassador to India stated in an interview that the ATV is based on the Akula:
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A high percentage of Indian arms equipment still has a high Russian content - with Arihant benefitting from Indian access to Western sub technology and those 140 Russian consultants.
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There is still the Agni SLBM version to be produced and the matter of its range. Given that India has been producing large diameter solid rockets (for its civilian space programme) for a lot longer than China, we may see this missile gap also close.
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Charting the development of the Arihant Class, particularly its reactor(s) and armament, is an ongoing process. More posts will follow.
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Pete