India and Germany Advance ₹90,000 Crore Project-75I Submarine Deal

What Happened

India and Germany are in the advanced stages of concluding an inter-governmental agreement for the massive ₹90,000 crore (approx. $10 billion) Project-75I submarine procurement program. The deal enables the domestic construction of six next-generation conventional diesel-electric submarines customized specifically for the Indian Navy.

When & Where

Negotiations were significantly accelerated during Defence Minister Rajnath Singh’s official three-day visit to Berlin, Germany, in late April 2026.

Who Is Involved

The strategic pact involves the Ministries of Defence of both India and Germany. The industrial execution will be handled through a partnership between Germany’s Original Equipment Manufacturer (OEM), Thyssenkrupp Marine Systems (TKMS), and India's state-owned Mazagon Dock Shipbuilders Limited (MDL).

How It Works

The project utilizes the "Strategic Partnership" (SP) model. TKMS will provide the core design authority and engineering consultancy for a hybrid of their U-214 and U212CD submarines. MDL will build all six platforms in Mumbai. The agreement mandates deep technology transfer, ensuring the submarines contain 45% indigenous components initially, scaling up to 60% by the final vessel.

Why It Matters

For GS Paper 3 (Internal Security/Defence), this deal is paramount. It addresses the critical capability gap caused by India's rapidly ageing sub-surface fleet. Equipped with extended underwater endurance, these vessels act as a formidable deterrent against the expanding naval presence of China and Pakistan in the contested Indian Ocean Region (IOR).

Historical Background

Conceived in the late 1990s, Project-75I is the direct successor to Project-75. Under the earlier project, India collaborated with France (Naval Group) to build six Kalvari-class (Scorpene) submarines, with the final unit commissioned in early 2025.

Previous Related Events

Project-75I faced years of bureaucratic delays and timeline extensions due to rigid technical specifications regarding proven propulsion technology and liability clauses. Ultimately, TKMS and Spain's Navantia emerged as the only technically qualified foreign bidders, with TKMS currently securing the leading edge.

Static GK Connection

Defence and Armed Forces fall squarely under the Union List of the Seventh Schedule of the Constitution. MDL, the primary shipyard executing the project, operates under the administrative control of the Ministry of Defence and is headquartered in Mumbai, alongside the Western Naval Command.

Future Impact

Crucially, this agreement reportedly grants India an export license. This means MDL will not just serve domestic needs; it has the potential to transform India into an export hub, supplying customized German-engineered submarines to friendly regional powers and drastically boosting India's global defence export footprint.

---

🔑 Key Points for Revision

• Project Name: Project-75 (India) or P-75I.
• Estimated Cost: ₹90,000 crore (approx. $10 billion).
• Objective: Build 6 conventional diesel-electric submarines.
• Key Partners: TKMS (Germany) and MDL (India).
• Crucial Tech: Fuel-Cell Air Independent Propulsion (AIP) system.
• Procurement Route: Strategic Partnership (SP) model.
• Vessel Design: Customized hybrid of U-214 and U212CD.
• Indigenisation: Starts at 45%, targets 60% locally sourced content.
• Strategic Shift: India gains export rights to sell these models globally.
• Geopolitical Goal: Counter adversarial naval footprints in the Indian Ocean Region.

---

🧠 Concept Link (Static GK Deep Dive)

Core Concept: Air Independent Propulsion (AIP) System

• Definition: AIP is an advanced marine propulsion technology that allows a non-nuclear (conventional) submarine to operate without access to atmospheric oxygen.
• The Problem It Solves: Standard diesel-electric submarines must frequently surface or use a snorkel to run diesel generators, which charge their batteries. Surfacing exposes them to radar and acoustic detection.
• How It Works: Fuel-cell AIP systems generate electricity by combining hydrogen and oxygen internally, producing only water and heat as by-products.
• Operational Advantage: It allows conventional submarines to remain submerged for weeks instead of days, drastically reducing noise and maximizing stealth.
• Cost-Efficiency: While not as enduring as nuclear-powered submarines (which can stay submerged indefinitely), AIP submarines are significantly cheaper to build and operate, offering high "sea-denial" capabilities at a fraction of the cost.
• Exam Angle: UPSC frequently asks candidates to distinguish between the capabilities, stealth profiles, and propulsion mechanics of Nuclear vs. Conventional vs. AIP-equipped submarines.

---

❓ Practice MCQs

Q1. The Project-75I defence program aims to procure which of the following for the Indian Navy?
A) Nuclear-powered ballistic missile submarines
B) Six conventional diesel-electric submarines
C) Three aircraft carriers
D) A fleet of anti-submarine warfare corvettes

Answer: B

Explanation: Project-75I is a military acquisition initiative to procure six conventionally-powered attack submarines equipped with advanced AIP systems for the Indian Navy.

Q2. Under the Project-75I negotiations, which foreign defence manufacturer has partnered with India's Mazagon Dock Shipbuilders Limited (MDL)?
A) Naval Group (France)
B) Boeing Defence (USA)
C) Thyssenkrupp Marine Systems (Germany)
D) Rosoboronexport (Russia)

Answer: C

Explanation: German defence major Thyssenkrupp Marine Systems (TKMS) is collaborating with MDL to build the submarines in India.

Q3. What is the primary operational advantage of installing an Air Independent Propulsion (AIP) system in a submarine?
A) It allows the submarine to launch nuclear-tipped ballistic missiles.
B) It enables the submarine to remain submerged for weeks without surfacing to recharge batteries.
C) It allows the submarine to operate safely in frozen Arctic waters.
D) It converts sea water into usable diesel fuel.

Answer: B

Explanation: An AIP module acts as a force multiplier by enabling conventional submarines to generate power internally, allowing them to remain submerged for extended durations and avoiding detection.

Q4. India's earlier submarine building program, Project-75 (which built the Kalvari-class submarines), was executed in collaboration with which country?
A) Russia
B) Germany
C) France
D) United Kingdom

Answer: C

Explanation: The earlier Project-75 resulted in the construction of six Scorpene/Kalvari-class submarines with technical assistance from France's Naval Group.

Q5. The Project-75I procurement is being executed under which specific policy framework of the Ministry of Defence?
A) Government-to-Government Direct Purchase
B) Strategic Partnership (SP) Model
C) Foreign Military Sales (FMS) route
D) Fast Track Procedure (FTP)

Answer: B

Explanation: Project-75I is a flagship program processed under the Strategic Partnership Model, which mandates an Indian firm to tie up with a foreign Original Equipment Manufacturer to manufacture platforms domestically.

Q6. Consider the following statements regarding the expected outcomes of the India-Germany submarine deal:

1. The submarines will be fully manufactured in Germany and shipped to India.
2. The agreement reportedly grants India an export license to sell these customized submarines to friendly nations.

Which of the statements given above is/are correct?

A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither 1 nor 2

Answer: B

Explanation: Statement 1 is incorrect because all six submarines will be built in India at Mazagon Dock Shipbuilders under technology transfer. Statement 2 is correct, highlighting a massive shift toward defence exports.

---

📜 Previous Year Question Style (PYQ)

PYQ 1:

With reference to the Indian Navy's submarine acquisition programs, consider the following statements:

1. Project-75I submarines will be entirely nuclear-powered.
2. The Strategic Partnership model aims to create a domestic defence manufacturing ecosystem by teaming private/public Indian entities with foreign vendors.

Which of the statements given above is/are correct?

A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither 1 nor 2

Answer: B

Explanation: Statement 1 is incorrect because Project-75I strictly involves the procurement of conventional diesel-electric submarines (albeit equipped with AIP technology). Statement 2 correctly describes the core philosophy of the Strategic Partnership model.

PYQ 2:

Assertion (A): Submarines equipped with Air Independent Propulsion (AIP) systems offer superior stealth compared to standard diesel-electric submarines.

Reason (R): AIP systems eliminate the need for the submarine to frequently surface to the periscope depth to access atmospheric oxygen for running its generators.

Select the correct answer using the codes given below:

A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true but R is not the correct explanation of A.
C) A is true but R is false.
D) A is false but R is true.

Answer: A

Explanation: Standard conventional submarines must surface to snorkel, increasing their vulnerability to radar and acoustic detection. Because AIP eliminates this need (Reason), the submarine maintains a vastly superior stealth profile (Assertion).

---

✍️ Mains Answer Pointers

Question: Evaluate the significance of Project-75I in modernizing the Indian Navy's sub-surface capabilities. How does the Strategic Partnership model under this project align with the objectives of 'Atmanirbhar Bharat'? (250 words)

• Introduction point: Introduce Project-75I as a ₹90,000 crore initiative to build six advanced conventional submarines in collaboration with Germany, addressing critical naval modernization needs.
• Security Dimension: The integration of Fuel-Cell AIP technology bridges the gap between conventional and nuclear platforms, providing persistent stealth capabilities vital for sea-denial operations against China and Pakistan in the IOR.
• Industrial Autonomy: Under the Strategic Partnership (SP) model, the mandate of up to 60% indigenous content shifts India away from a buyer-seller dynamic toward total technological absorption.
• Export Hub Potential: Highlight the provision of an export license for MDL, converting India from a net importer into a potential global supplier of advanced submarines.
• Economic Impact: The mega-project will stimulate the domestic MSME sector, create high-skilled manufacturing jobs, and build a resilient supply chain immune to geopolitical sanctions.
• Conclusion point: By prioritizing indigenous manufacturing and long-term technology transfer over outright imports, Project-75I exemplifies the true essence of 'Atmanirbhar Bharat', ensuring India's strategic autonomy in the maritime domain.
• Suggested diagrams: A simple table comparing the endurance and capabilities of standard Diesel-Electric vs. AIP-equipped vs. Nuclear submarines.

---

⚠️ Examiner Trap

• Trap 1: Students often confuse Project-75 with Project-75I. The correct fact is that Project-75 (French collaboration/Scorpene class) is mostly complete, while Project-75I (German collaboration/AIP equipped) is the next-generation successor currently being finalized.
• Trap 2: A common wrong assumption is that these new submarines are Nuclear-powered because of their high cost and long endurance. The reality is they are Conventional Diesel-Electric submarines enhanced with Air Independent Propulsion (AIP).

---

🧭 Exam Tip

For UPSC Prelims S&T section, ensure you clearly understand the mechanism of Fuel-Cell AIP systems and why they are technologically superior to Stirling engines. For Mains GS-3, always use Project-75I as your primary case study when writing answers about the success/implementation of the Strategic Partnership (SP) Model in defence procurement.