Brig Arvind Dhananjayan

India’s Submarine Development Plan (SDP)-2030 is quantitatively focused on development of Diesel-Electric Attack (DEA) submarines (SSKs) and Nuclear Attack Submarines (SSNs). It is complimented with the development and induction of SSBNs (nuclear-powered submarines capable of firing ballistic missiles), which is imperative for nuclear deterrence on a regional and global scale to counterbalance the threat of China’s fast-paced naval modernization.

The Indian Navy currently operates two nuclear-powered attack submarines – INS Arihant and INS Arighat. INS Arihant was commissioned in 2016, and INS Arighat in 2022. The Indian Navy plans to build six SSNs of the Arihant class. The third and fourth submarines in the class, INS Aridhaman and INS Arighot, are under construction. The fifth and sixth submarines are still in the design stage.

The Indian Navy’s future plans for its SSN fleet include the construction of the Scorpene-class SSNs as explained in this article.

Acquisition of DEA Submarines/SSNs

Being largely oriented towards regional operations, the Indian Navy is predominantly focused on efforts towards safeguarding India’s territorial waters and deterring any inimical act of aggression by a potential adversary, either off the Eastern/Western Seaboards and the avenues of ingress into these waters or in the Northern Indian Ocean, which is traversed by favourable Sea Lines of Communication (SLOC). Concomitantly, China and Pakistan would have to set aside substantial naval resources to offset a surface and sub-surface threat from the Indian Navy to its naval patrols and mercantile shipping in these waters. The Indian Navy would also be tasked to effectively blockade Pakistan Navy’s attempts at any maritime misadventure off the peninsula. These tasks make it essential to have capabilities, among others, for maritime deterrence and sea denial.  While the former is a fallout of the combined operational capability of the Indian Navy, the latter would largely constitute the responsibility of the submarine arm.

Such an argument, among other financial and temporal considerations, would have influenced the decision to persevere with acquisition of modern SSKs and SSNs as part of the SDP.

Apart from the SSBNs mentioned, the acquisition of SSNs would significantly enhance the reach and stealth quotient of India’s sub-surface fleet, as SSNs have the capability to carry out fleeting attacks on an adversary’s static and sea-based assets, while staying submerged for protracted periods.

Growing Submarine Arm

Following the decision to introduce submarines into the Indian Navy six decades ago, imports and collaborative submarine-building ventures with foreign firms have effectively maintained a credible sub-surface fleet. In the aftermath of the Kargil War, the Cabinet Committee on Security (CCS) approved a 30-year SDP to enable acquisition of 24 conventional submarines. Thus came into being a two-phase plan, with Project-75 and Project-75 (I) [75 (India)] constituting the initial phase, each envisaging development of six SSKs. The subsequent phase of 12 SSKs was envisaged to be undertaken indigenously. However, in keeping with the rapidly expanding maritime threat from China, the Indian Navy approached the CCS in early 2021, with a proposal to replace six of the balance 12 SSKs with SSNs, under the moniker of Project-75A/76.

Project-75, in collaboration with the French Naval Group (formerly DCNS), has now fructified, with five Kalvari Class (Scorpene) submarines having been commissioned and the sixth undergoing sea-trials.

Project 75A/76 

Project 75A/76 envisages the indigenous development of six SSNs over the present and next decade, with 6000-ton displacements and an overall projected cost of Rs. 96,000 crores. These vessels will be designed by the Indian Navy’s Directorate of Naval Design (DND) and manufactured at Vishakhapatnam.

Advanced Technology Vessel

In order to enhance the Indian Navy’s strategic reach, the Advanced Technology Vessel (ATV) programme was commissioned, envisaging development of four SSBNs (INS Arihant, commissioned in August 2016 and INS Arighat undergoing sea-trials, with two more larger vessels under development). These submarines would provide practically unlimited range, with intercontinental strike capability, as a component of India’s nuclear triad. These developments were spurred on by the void created due to termination of a brief three-year lease of INS Chakra-I, a Soviet SSN, which ended in 1991; and the subsequent expiry last year of a 10-year lease of INS-Chakra-II, an Akula-II Class SSN from Russia. A further addition to these ranks will come in the form of another Akula Class Russian submarine, INS Chakra-III, slated to be leased in 2025 for 10 years.

Project-75 (I)

Project-75 (I) could not be progressed concurrently as envisaged under the 30-year plan due to various reasons. Hence, the Naval Staff Qualitative Requirements for the project were modified to include procurement of SSKs with state-of-the-art Air-Independent-Propulsion (AIP) systems, enabling them to stay submerged for longer durations and substantially increasing their operational range and lethality. 

In October 2014, India’s Defence Acquisition Council (DAC) decided that all six submarines would be constructed in India, and in June 2017, it was reported that the contract for construction would be awarded under the “Strategic Partnership” Model (SPM). This referred to participation of Indian firms along with foreign manufacturers under the ‘Make in India’ paradigm of Defence Acquisition Procedure-2020. The DAC subsequently approved an enhanced budget in January 2019.

Concurrently, an Empowered Project Committee (EPC) was constituted to steer the project till contract conclusion and Acceptance of Necessity (AoN) for the project was accorded.  In January 2020, the EPC shortlisted Larsen & Toubro (L&T) and MDL as the two Indian firms that would collaborate with one of five shortlisted foreign manufacturers for the project. On 20 July 2021, the CCS allowed issuance of Request for Proposal (RFP) under the SPM to both Indian firms for a total amount of ?43,000 Crores, making this the first project under the SPM and India’s largest defence acquisition project!

The SPM envisages the setting up of manufacturing lines in India along with Transfer-of-Technology. Consequently, three of the five shortlisted foreign vendors exited, citing unfavourable contract clauses. Acceptance of the RFP by the balance two foreign firms saw MDL signing a pre-emptive agreement with German shipbuilder ThyssenKrupp Marine Systems (TKMS) in June 2023, while L&T had signed a Teaming Agreement with Spanish shipbuilding company Navantia on 11 April 2023 – both for the purpose of submitting a techno-commercial bid for the project. As per these pre-emptive agreements, Navantia would, if shortlisted, design and develop these submarines based on its Isaac Peral S-80 Submarine (due to be delivered to the Spanish Navy by end 2023), which boasts the most advanced AIP system in the world today. TKMS is, meanwhile, reported to be offering its Type 214/218 DEA submarines with AIP. Induction of Project-75 (I) submarines is expected to commence by the end of this decade.

Recent Developments

As part of the SDP, the DND, assisted by the DRDO, is reportedly working on the design of an indigenous DEA with AIP, soon envisioned to become the mainstay of India’s future SSK fleet. The DAC, in its meeting on 13 July, discussed the acquisition of three more Kalveri Class (Scorpene) submarines with AIP, as outlined in Project 75 (I), to be built at MDL and validated by France’s Naval Group, likely via a Government-to-Government contract. The Naval Group had earlier set up a 100% owned subsidiary, Naval Group India, with presence in New Delhi and Mumbai, to oversee the ‘Make in India’ commitment of Project-75, with an investment of over Rs 100 crores for establishment of three workshops for maintenance, spares and future refit of the Project-75 submarines. These workshops are also involved in validating the DRDO-developed AIP system for installation on existing submarines and those proposed for acquisition. An MoU between Naval Group and MDL was also reportedly signed, on 6 July 2023, for collaboration on the proposed acquisition of the additional submarines, which would include fitting of indigenous AIP and other onboard systems, resulting in a significantly higher indigenous content than before. Naval Group India would also oversee the fitting of indigenous AIP on existing Project-75 submarines as they commence their refit, beginning with INS Kalvari in 2024. The fitting of the indigenous AIP plug would require certain modifications to the hull of the submarines, including extension in length and subsequent integration, which would also be overseen by the Naval Group.

The revised Indo-French Joint Statement, issued on 14 July at the end of prime minister Narendra Modi’s visit to France to mark the 25th anniversary of the India-France Strategic Partnership, omits specific mention of these submarines but reiterates the joint readiness of both nations to explore development projects for expansion of India’s submarine fleet. This may be construed as a positive indicator for fruition of such acquisition by India.

Presently, design work for the SSNs is underway at the Submarine Design Group (SDG) under the DND, with the preliminary design phase having been completed in early 2020. The SDG, assisted by DRDO, is presently involved in the detailed design phase of the project. Construction of SSNs is expected to commence in 2023-24. with the first submarine expected to enter service in 2032.

Comments

Surveillance over India’s vast 7,500 km coastline, a 2 mn square Exclusive Economic Zone, and island territories off the eastern/ western coasts is a colossal mandate. Add to this the onerous responsibility of being a ‘net security provider’ in the Indian Ocean Region (IOR), and India’s Navy and Coast Guard are landed with the unenviable charge of protecting India’s waters/seaboards from all forms of economic/military intrusion. Both China and Pakistan have viable navies capable of choking India’s maritime trade and denying operational sea-space for military or mercantile movement. Apropos, the Indian Navy on the cusp of metamorphosing into a genuine blue-water force, needs to be able to project maritime power, control sea-space for furtherance of own operations and deny the same to India’s potential adversaries. It is therefore imperative that India looks at self-reliance and indigenization to consolidate and enhance the effectiveness of its surface and sub-surface arsenal.

With 18 operational submarines at present, the Indian Navy’s Submarine Development Plan constitutes a much-needed fillip, in addition to the existing sub-surface fleet undergoing regular planned refit, refurbishment and modernization, to maintain its submarine arm as a potent and lethal sub-surface force.

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The Deputy Director of the Russian Federal Service for Military-Technical Cooperation, Vladimir Drozhzhov, said on the sidelines of the ongoing Aero India 2023 show that the development of this proposed submarine based on Amur 1650 will include a localization level of up to 80%.

This proposal comes when India is looking to sign an agreement to develop diesel-electric submarines under the P-75I this year. The country issued a Request for Proposal (RFP) to five foreign contenders, including Russia, in 2021.

According to the RFP, the six planned diesel-electric attack submarines are expected to include advanced capabilities such as Air-independent propulsion (AIP), Intelligence, Surveillance and Reconnaissance (ISR), Special operations forces (SOF), Anti-ship warfare (AShW), Anti-submarine warfare (ASW), Anti-surface warfare (ASuW), Land-attack capabilities, and other features.

However, the programme hangs in the balance after most foreign manufacturers that received the RFP, including Russia, decided against competing for the project. While proposing the co-development of the all-new sub, Drozhzhov acknowledged that Russia had backed out of Project 75I’s tender.

“Along with this, we offer our Indian partners a variant of cooperation on this topic, including the joint designing and production of a national non-nuclear submarine under the 75 (I) program based on an intergovernmental agreement,” the Russian official said.

“Taking into account our experience of working with the Indian side on other naval projects, localization of production during the implementation of the program for the construction of Project-75 (I) submarines based on the Russian platform Amur-1650 can be increased to 70-80%.”

Foreign contenders that received the RFP from India withdrew from the tender for two reasons – qualitative requirements with a particular emphasis on Lithium cell Air-Independent Propulsion and a strict liability clause that puts the obligation on the foreign partner for the submarines’ performance despite them being built in Indian shipyards.

Currently, Project 75I has only a single vendor, i.e., a South Korean company that is the only bidder offering a proven fuel cell air-independent propulsion (AIP) system.

Some reports earlier suggested that the project may even be shelved. However, the Navy Chief expressed the service’s commitment to the program before Navy day in December last year.

Several delays have already marred the project. Russia’s proposal, thus, comes at an opportune moment.

Russian Amur-1650 Submarine

Rosoboronexport describes the Amur 1650 as a diesel-electric submarine that belongs to a new generation of Russian non-nuclear submarines. According to the exporter, the vessel has been designed specially to destroy hostile navy surface combatants, transports, and submarines and lead reconnaissance parties.

Regardless of the weather, the Amur 1650 submarine can complete vital global missions. This is significant as India is looking to significantly augment its naval fleet to combat PLA Navy’s expanding presence in the Indian Ocean Region (IOR).

The submarine is equipped with a powerful sonar system with low noise, high levels of automation, and the capacity to fire both torpedoes and the Club-S missile system. As per a report published in TASS in 2019, the submarine that is proposed to be jointly developed by India and Russia would also be equipped with BrahMos cruise missiles.

The submarine can carry anti-ship cruise missiles, adaptable deep-water torpedoes, and mines. It can attack enemy territory-wide terrestrial targets. The data required to launch missiles and torpedoes is created and fed into the submarine’s automated command information system.

The Amur 1650 submarine can have a fuel cell air-independent propulsion system installed, extending its underwater travel time by up to 20 days. The AIP is a core requirement of the diesel-attack submarine to be built under Project 75I and has led to most contenders withdrawing from the tender.

Further, an attack periscope with optical and video linkages (night vision included) and an optronic non-penetrating mast are incorporated into the periscope module of the submarine. The pole is also equipped with antennas for catching signals from satellite navigation systems and radars.

The GLONASS and GPS receivers in the navigation system allow for the precise determination of the submarine’s current location and the motion parameters required for safe navigation and the use of weapons.

A trailing antenna is part of the automated radio communication system and is used to receive secure command signals and data communications at depths of up to 100 meters.

Project 75I will take place under the strategic partnership model, and the capabilities will be developed in conjunction with domestic private players. India has stressed that it needs a higher level of indigenization, including in production.

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The fifth diesel attack submarine 1775 tonne INS Vagir was commissioned by Navy Chief Admiral Hari Kumar on Monday at MDL in Mumbai and the sixth of the Kalvari class INS Vagsheer is expected to be commissioned later this year or early 2024.

According to South Block officials, the Indian Navy is expected to approach the Defence Acquisition Council (DAC) soon for acceptance of necessity (AoN) for three more diesel attack submarines under the “Make in India” project with the French Naval Group expected to test the DRDO developed AIP system before fitting in the new submarines. Initially, the Navy had the option to construct three more submarines after contracting six with the Naval group, but this option was cancelled in 2016 after Naval Headquarters wanted the government to clear six submarines under Project 75 (I) or fitted with AIP after floating global tenders.

While the Defence Ministry floated request for information for its Project 75 (I) in August 2021, major submarine design and developers except for South Korea showed little interest in making AIP fitted submarines for India as lithium-ion technology had taken over conventional attack submarines and the big P-5 powers were only making nuclear powered conventional attack submarines or SSNs. Given the possibility of a single vendor option apart from the Modi government totally committed to “Aatmanirbhar Bharat”, the Navy went back to the drawing board on the submarine line.

With China rapidly expanding its Navy including nuclear attack submarines, the Indian Navy could ill-afford to keep its functioning submarine construction line at MDL idle while debates went on about the right submarine to acquire for India’s maritime security (a must, given the country’s 7500 km long coastline). The Kalvari class submarines or Project 75 was approved by the A B Vajpayee government in 1997 and the project was expedited in 1999 after the Kargil War with Pakistan. The first Kalvari class submarine was commissioned 18 years later on December 14, 2017, with the then Defence Minister Manohar Parrikar urging the Navy to exercise the option for the additional three submarines soon.

It is understood that the Indian Navy’s leadership is now rethinking Parrikar’s proposal and is expected to ask for three more Kalvari class submarines fitted with DRDO’s AIP. The same AIP will be retrofitted into existing Kalvari class submarines when they come to MDL for a mid-life refit.

While the Navy wants three indigenous nuclear attack submarines to expand its footprint in the Indo-Pacific, there is a strong possibility that India and France may collaborate to export Kalvari or Scorpene submarines to countries such as Indonesia. India’s sea based nuclear deterrent is operational with two nuclear powered nuclear ballistic missile armed submarines already patrolling global waters and a third under fitment.

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The industry has matured. It has moved from designing as per drawings to now having the ability to design according to the specifications. The encouragement to industry is showing. We have roped them in to make big equipment, on integration of missiles, bombs and many other systems.

The immediate targets, according to Dr Reddy, are increasing the range of air-to-air missiles beyond 150 km and that of surface-to-air missiles beyond 250 km.

Airborne radars and long-range 1,000-plus km radars are the next on plan, with the Active Electronically Scanned Array (AESA) radar for fighter jets ending its final testing. For the Advanced Medium Combat Aircraft (AMCA), DRDO “may go in for the special purpose vehicle model”.

The Light Combat Aircraft (LCA) Mark2 is in the final design phase, while the AMCA design is in advanced stages. “We will definitely meet timelines on the AMCA and LCA Mark2,” he said.

On ground fighting equipment, Dr Reddy said, “We are looking for partners for Future Infantry Combat Vehicle (FICV) and Future Ready Combat Vehicles (FRCV).”

The scenario, he points out, is changing. “We are getting enquiries for export of Akash missiles, torpedoes and artillery gun, the ATAGS, to name a few.”

Air Independent Propulsion System (AIP), that allows conventional submarines to remain under water for longer periods, has been demonstrated. “We are working to integrate the system. The basic model has been made.”

India, he said, has become self-sufficient in many technological areas like missiles, radars, sonars, electronic warfare systems, Airborne Warning And Control System (AWACS), artillery guns, armoured vehicles and fighter aircraft.

“Industry participation is growing. We have at least 2,000 industries, which are capable of making systems and sub-systems of equipment. Close to 10,000 are now suppliers of components,” according to Dr Reddy, who is also the secretary, Department of Defence R&D.

“Industry has matured. It has moved from the ability to design as per drawings to now have the ability to design as per specifications,” he says.

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The RFP for the Project 75 (I) was sent to France’s Naval Group-DCNS, Russia’s Rosoboronexport, Germany’s Thyssenkrupp, Spain’s Navantia and South Korea’s Daewoo. As this project will be completed under the Strategic-Partnership model. All three European and Russian companies have now pulled out of this project, leaving only Navantia and Daewoo in the race.

These five companies had to choose between two Indian companies, Mazagon Dock Shipbuilders Limited (MDL) or Larsen & Toubro (L&T), to manufacture these six submarines in India.

The provision was to build these six conventional submarines in the country only in a joint venture with a foreign company.

Scorpenes Under Construction

The Naval Group is making six Scorpène-class submarines in collaboration with MDL. Of these, four, the Kalvari-class submarines, have joined the Navy, the fifth is under sea-trial and the sixth Vagsheer was launched earlier this month.

These are six conventional diesel-electric submarines. AIP, ie, Air-Independent Propulsion system developed by DRDO will be retrofitted during mid-life upgrade. The advantage of AIP is that they will not need to get out of the sea again and again. That is, in a way, they are stealth-submarines. AIP allows non-nuclear submarines to operate without access to atmospheric oxygen. These stealth-submarines do not need to be taken out of the sea like the diesel-electric submarines.

Background

Vagsheer — the last of six Indian-made Scorpene-class submarines — was lowered into the water for trials in Apil. The Indian Navy has six new underwater boats, four of which (Kalvari, Khanderi, Karanj and Vela) are in service and the others (Vagir and Vagsheer) will be commissioned by early 2023.

Failure to conclude the construction of six more Project 75(I) conventional submarines with AIP will mean the assembly line will be idle. Technical skills to manufacture a submarine will be lost if a deal is not finalised soon.

India commenced getting its Foxtrot-class submarines from December 1967, from the then USSR. By 1974, it had eight such submarines. In 1981, New Delhi entered into an agreement with German HDW, to buy two Type 209 submarines. While these submarines — INS Shalki and INS Shankul — were being built the HDW scam broke out. The government did not use the ‘option clause’ in the agreement for the construction of two additional submarines.

By 2028-29 most of the Kilo-class submarines may be out of action. The Russian submarines have been the mainstay of the Indian fleet for the past two decades. As replacement for the old Foxtrots, India turned to Moscow and bought ten Kilo-class boats, commencing mid-1980s. The last of the Kilo-class boat – INS Sindhushastra – was commissioned in 2000. Of these, INS Sindhurakshak exploded and sank near Mumbai in 2013. India gifted the decommissioned INS Sindhuvir to the Myanmar Navy. Seven out of the eight remaining submaines have outlived their lifespan but are still functioning due to upgrades.

In February 1999, the Cabinet Committee on Security approved a 30-year plan that envisaged two production lines – P-75 and P-75I – to make 12 submarines at two Indian shipyards.

The UPA government signed the Rs 23,653 crore P-75 deal in 2005. As per the contract, the French supplier DCNS was to deliver all the six submarines — manufactured at MDL — by 2012. Though the 30-year plan envisaged two production lines operating simultaneously, the government decided to go for only one.

The first Scorpene submarine was handed over to the Indian Navy in 2017, five years late.

The defence ministry had, in April 2021, cleared the way for the construction of six new stealth P75I submarines for the Indian Navy amid the challenges being faced by China in the Indian Ocean. The Defence Acquisition Council had given the green signal under the Strategic Partnership Model. The ministry issued the RFP in July 2021. The cost of this project named Project 75 (India) is Rs 43,000 crore.

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