# India's submarine decade: P75I IGA signed with Germany, third SSBN commissioned, AIP refit ready > A Rs 70,000-99,000 crore inter-governmental agreement with Berlin for six Type-214 AIP submarines cleared Finance Ministry in May 2026; the sixth Scorpene entered service in January 2025; India's third ballistic missile submarine was reportedly commissioned in April 2026; the DRDO indigenous AIP module is ready for fleet retrofit **Meta:** type: story · date: 2026-05-28 · heads: اللعبة الطويلة, أموال من · 9 takes · 6 lenses · 3 regions ## Summary [India](/ar/entity/india)'s submarine fleet is expanding simultaneously across conventional and nuclear tracks. On the conventional side: INS Vagsheer, the sixth and final Scorpene-class submarine under the P75 programme, was commissioned at Naval Dockyard Mumbai on 15 January 2025, closing a 17-year build cycle with Mazagon Dock Shipbuilders and Naval Group of [France](/ar/entity/france). The successor programme, P75I, moved to a new bilateral axis: Spain's Navantia was disqualified in early 2025 and [Germany](/ar/entity/germany)'s TKMS emerged as sole qualifying bidder for six Type-214 AIP submarines; an Inter-Governmental Agreement was signed on 12-13 January 2026 during German Chancellor Friedrich Merz's state visit to New Delhi, and the Finance Ministry cleared the deal on 28 May 2026. Cabinet Committee on Security approval is the remaining gate before the contract, valued between Rs 70,000 and Rs 99,000 crore, can be signed. Separately, DRDO's indigenous Air Independent Propulsion module, based on phosphoric acid fuel cells, completed qualification and is ready for installation aboard INS Khanderi during a July 2026 refit, the first time Indian-designed AIP will be fitted to a front-line submarine. On the nuclear side: India's third ballistic missile submarine, INS Aridhaman (S4), was reported commissioned in April 2026 by Indian defence publications; the government has not officially confirmed the date, consistent with India's practice on nuclear programmes. INS Aridhaman carries eight VLS tubes capable of launching K-4 (3,500 km range) or K-15 SLBMs. The INS Varsha nuclear submarine base at Rambilli in Andhra Pradesh, designed to shelter SSBNs in hardened berths, is targeted for initial operational capability in 2026. ## The split Indian coverage (The Hindu, Business Standard, The Print) frames the P75I IGA as strategic diversification: Germany replaces Spain and adds a non-traditional partner to India's submarine supply chain, reducing concentration in French and Russian technology. European defence-industrial press (Army Recognition, Naval News) reads the IGA as TKMS's most significant export submarine contract and a marker of Germany's post-Ukraine willingness to become a serious defence exporter. Pakistani commentary (Jang, Dawn) contextualises the SSBN programme as the structural factor behind any India-Pakistan nuclear calculus, noting that INS Aridhaman's commissioning means India now maintains a continuous at-sea nuclear deterrent. Chinese state-aligned outlets (Global Times) have previously described Indian SSBNs as "destabilising the Bay of Bengal," though Beijing's official position does not comment on the P75I. ## By the numbers - Rs 70,000-99,000 crore ($8.4-11.9B), P75I deal value for six Type-214 AIP submarines. - January 12-13 2026, P75I IGA signed during German Chancellor Merz's New Delhi visit. - May 28 2026, Finance Ministry clearance of P75I IGA. - January 15 2025, INS Vagsheer commissioned, completing the six-boat Scorpene/Kalvari programme. - 8, VLS tubes on INS Aridhaman, capable of K-4 SLBMs with 3,500 km range. - 3, total SSBNs in Indian service once INS Aridhaman is confirmed operational. ## Why it matters P75I closes the most glaring gap in India's conventional submarine force: the entire Scorpene fleet lacks AIP, meaning boats must surface or snorkel frequently and are detectible at a range that disadvantages them in the Andaman Sea and Arabian Sea operational areas. Six Type-214s with German AIP would give India a continuous conventional-submarine capability comparable to what Pakistan operates with its Agosta-90B fleet. The indigenous DRDO AIP programme, if it works aboard INS Khanderi, could also retrofit older boats at far lower cost than new-builds. On the nuclear track, three SSBNs means India can maintain one on deterrent patrol, one in maintenance, and one in training, roughly the minimum for a credible continuous at-sea deterrent. The INS Varsha base matters because it removes a single chokepoint vulnerability: dispersed hardened berths complicate any adversary's first-strike planning. ## What to watch - CCS approval of the P75I commercial contract and formal signing date. - DRDO AIP retrofit performance aboard INS Khanderi and whether the module is cleared for the broader fleet. - INS Varsha base operational milestone. - Whether the three-boat Scorpene follow-on (under informal discussion at Rs 36,000 crore) is formally sanctioned. - Official confirmation of INS Aridhaman's commissioning and patrol schedule. ## Regional takes (batched by bias / lens) ### Indian financial / defence-industrial - **Business Standard** (India, en) — Reports the Finance Ministry's 28 May 2026 clearance of the P75I inter-governmental agreement with Germany, covering six Type-214 AIP submarines at Rs 70,000-99,000 crore via TKMS and Mazagon Dock Shipbuilders, with Cabinet Committee on Security approval as the remaining gate. > "India's Finance Ministry cleared the P75I submarine IGA with Germany in May 2026, opening the final gate toward a Cabinet Committee on Security sign-off on one of India's largest ever defence contracts." Source: https://www.business-standard.com/external-affairs-defence-security/news/india-germany-p75i-submarine-iga-signed-finance-ministry-cleared-126052801.html ### European defence-industrial - **Army Recognition** (France, en) — European defence-industrial perspective on the January 2026 P75I IGA signing during German Chancellor Friedrich Merz's state visit to New Delhi, noting TKMS as sole bidder after Navantia's disqualification and the strategic significance of Germany entering India's strategic submarine programme. > "Germany and India signed a P75I IGA for six Type-214 submarines in January 2026, the first major German-Indian defence IGA and TKMS's largest export submarine contract." Source: https://www.armyrecognition.com/news/navy-news/2026/india-germany-sign-p75i-iga-type-214-aip-submarines-mazagon-dock ### Indian defence-research community - **IDRW** (India, en) — Reports DRDO's announcement that the indigenous Air Independent Propulsion module, based on phosphoric acid fuel cells, has completed qualification testing and is ready for integration into INS Khanderi during a scheduled refit in July 2026, making it the first indigenous AIP system fitted to a front-line Indian submarine. > "DRDO's indigenous AIP module based on phosphoric acid fuel cells is ready for installation aboard INS Khanderi in July 2026, the first such retrofit on a front-line Indian Navy submarine." Source: https://idrw.org/india-drdo-aip-module-ready-ins-khanderi-refit-2026/ ### International naval affairs - **Naval News** (France, en) — Documents the January 15 2025 commissioning of INS Vagsheer, the sixth and final Scorpene-class (Kalvari-class) submarine at Naval Dockyard Mumbai, completing the P75 programme; notes the 17-year span from project sanction to completion and the indigenous combat management system fitted in later boats. > "INS Vagsheer, India's sixth Scorpene-class submarine, was commissioned on 15 January 2025, completing a 17-year programme and handing the Indian Navy its most capable conventional submarine force." Source: https://www.navalnews.com/naval-news/2025/01/ins-vagsheer-commissioned-india-completes-six-scorpene-class-submarines/ ### Indian mainstream - **The Hindu** (India, en) — Reports the commissioning of India's third SSBN, INS Aridhaman, in April 2026; notes the government has not officially confirmed the date, consistent with India's practice of not disclosing nuclear submarine movements; describes the vessel as carrying eight VLS tubes capable of launching K-4 or K-15 SLBMs. > "India commissioned its third nuclear-powered ballistic missile submarine, INS Aridhaman, in April 2026, extending the country's sea-based nuclear deterrent, though no official announcement was made." Source: https://www.thehindu.com/news/national/india-third-nuclear-submarine-aridhaman-commissioning-2026/article68901234.ece ### unlabelled - **Indian Defence News** (India, en) — Source: https://www.indiandefensenews.in/2026/04/ins-aridhaman-ssbn-commissioned-india-third-nuclear-submarine.html - **DW (Deutsche Welle)** (Germany, en) — Source: https://www.dw.com/en/india-germany-submarine-deal-merz-new-delhi-2026/a-71234567 - **The Print** (India, en) — Source: https://theprint.in/defence/p75i-india-germany-type-214-submarine-iga-finance-ministry/ - **Livefist** (India, en) — Source: https://www.livefist.com/2026/01/p75i-iga-signed-germany-india-type-214-submarines/ ## Across the graph - Related: [[india-indigenous-warship-commissioning]], [[india-tejas-mk2-amca-2026]], [[india-rafale-114-source-code-2026]] - Entities: India, Germany --- Canonical: https://rbtfl.xyz/ar/n/india-submarine-buildup-2026