India Secures ISA Contract for Polymetallic Sulphides: Strategic Win or Overlooked Gamble?
On 16 September 2025, India signed a landmark contract with the International Seabed Authority (ISA) for the exploration of polymetallic sulphide (PMS) deposits in the Carlsberg Ridge, a 300,000 sq. km stretch between the Indian and Arabian tectonic plates in the northwest Indian Ocean. This is India’s first foray into PMS exploration in international waters, following earlier ISA contracts for polymetallic nodules in the Central Indian Ocean Basin and another for PMS in the Indian Ocean Ridge. Both existing permits expire in 2027 and 2031, respectively. Importantly, this latest initiative aligns with India’s ambitious Deep Ocean Mission, unveiled in 2021 with an outlay of nearly ₹4,077 crore. But while the headlines celebrate a leap toward resource security, the operational complexities and geopolitical entanglements reveal a more ambivalent story.
Why the Carlsberg Ridge Contract Changes the Game
The Carlsberg Ridge contract breaks from India’s prior ISA exploration regimes by targeting PMS deposits—critical for industrial metals like copper and zinc, as well as gold and rare-earth elements. Polymetallic sulphides possess higher concentrations of such minerals compared to nodules, offering an economic advantage. The timing is significant: India applied for exploration rights here and in the Afanasy-Nikitin seamount (ANS) in early 2024, but while the Carlsberg Ridge contract was granted, the ANS region remains pending. Sri Lanka has also staked its claim in the contested ANS zone, complicating approvals.
Geopolitically, this is India’s first major secured exploration area along its western maritime frontier in the Arabian Sea—a zone traditionally less leveraged in India’s resource strategy compared to the Central Indian Ocean Basin. Additionally, the ridge’s tectonic characteristics make it an area of interest not just for mining but also for seismic research, a potential intersection with the Ministry of Earth Sciences’ geological and oceanographic objectives.
Institutional Machinery and ISA Oversight
The International Seabed Authority, established under UNCLOS 1982, regulates all mineral exploration beyond national jurisdictions. Its operations hinge on an intricate balance between economic resource extraction and environmental preservation. India’s signing of the Carlsberg Ridge agreement follows similar provisions outlined in earlier ISA accords, requiring compliance with strict environmental protocols under Section 5 of the 1994 Agreement. ISA’s responsibility to protect “the common heritage of humankind” underscores this regulatory framework.
Operationally, India now joins the ranks of 19 other nations with active ISA contracts for seabed exploration. This milestone also signals India’s heightened role in global deep-sea mining governance. Tasked with executing exploration will likely be the National Institute of Ocean Technology (NIOT), which serves as the nodal agency for India’s Deep Ocean Mission. Whether NIOT possesses the institutional capacity to scale up operations in the Carlsberg Ridge remains to be seen—it has so far concentrated its activities primarily in the Central Indian Ocean Basin.
The Troubling Gap Between Promise and Ground Reality
Despite the framing of the Carlsberg Ridge contract as futuristic resource diplomacy, there are questions about feasibility. Operational cost estimates for exploring PMS nodules can reach as high as USD 1,000 per tonne, given the depths involved—exceeding 3,000m in this region. Will India’s ₹4,077 crore budget under the Deep Ocean Mission suffice for the complex technology required? Early pilot studies funded under the Mission have been promising but remain limited in scope.
Beyond cost, environmental concerns dominate. Deep-sea mining risks disturbing fragile marine ecosystems, particularly hydrothermal vent habitats where polymetallic sulphides form. ISA oversight mechanisms, while laudable, have faced criticism in green circles; its Draft Exploitation Regulations, yet to be fully adopted, offer insufficient specificity on biodiversity protection. This regulatory lacuna leaves exploration contracts like India’s vulnerable to ecological backlash.
What of institutional preparedness? While NIOT has earned respect among ISA member states for its engineering expertise, its resource constraints remain under-discussed. India’s seabed excavation capabilities lag behind that of nations like China, which boasts state-of-the-art polymetallic nodule extraction systems already deployed. That infrastructure gap could translate into delays.
The Sri Lanka Angle and Geopolitical Friction
An elephant in the room is India’s pending exploration bid in the Afanasy-Nikitin seamount. Sri Lanka’s competing claim to this region adds tension to bilateral ties that have already been tested by contentious fisheries disputes in the Palk Strait. Could India’s successful bid for the Carlsberg Ridge set a precedent for ISA adjudication in the ANS zone? Sri Lanka could argue that India’s exploration scope risks encroaching beyond ISA permit limits.
Notably, China’s approach in the Pacific International Seabed Area provides a revealing contrast. Beijing has leveraged ISA contracts not just for PMS extraction but also for strategic infrastructure deployment, using contracts as soft geopolitical tools. If Sri Lanka were to seek external partnerships—perhaps even with China—to validate its ANS claim, India’s foothold in the western Indian Ocean could face counterbalancing forces.
Uncomfortable Questions: What Nobody Is Asking
First, what happens if mineral extraction yields fall below projections? ISA exploration contracts come with steep upfront investments, which developing economies like India often justify through optimistic market forecasts. If the PMS deposits in the Carlsberg Ridge prove less commercially viable than expected, will policymakers pivot away from seabed mining altogether—or persist with a potential white elephant?
Second, how will state-level variation influence outcomes? Coastal states like Tamil Nadu and Gujarat have proven adept at partnering with major industrial players for inland mining projects. Could they replicate similar public-private models for deep-sea ventures, or will the centralization of seabed permits stifle subnational innovation?
Finally, there is the uncomfortable timing. With major maritime zones increasingly subject to security overlays amid India's Indo-Pacific strategy, is this mineral extraction agenda quietly overlapping with broader defense policy imperatives? Traditional proponents of ISA sovereignty may interpret this nexus as mission creep.
International Comparison: Lessons from South Korea
South Korea’s ISA contract for polymetallic sulphides in the Pacific Basin provides a useful comparative anchor. Granted in 2016, Korea has operationalized multiple pilot studies in partnership with private-sector firms like Hyundai. Importantly, these ventures have combined exploration with in-situ environmental monitoring aimed at real-time biodiversity assessment. India’s NIOT could emulate Korea’s risk-mitigation protocol—current Deep Ocean Mission documents suggest only piecemeal environmental provisions.
Exam Questions
- Prelims MCQ 1: Which body regulates seabed mining activities in international waters? (A) United Nations Environment Program (UNEP) (B) International Labour Organisation (ILO) (C) International Seabed Authority (ISA) (D) United Nations Development Programme (UNDP) Correct Answer: (C)
- Prelims MCQ 2: Which mineral type is primarily extracted from polymetallic sulphide deposits? (A) Uranium (B) Copper (C) Lithium (D) Potassium Correct Answer: (B)
Mains Question: To what extent has India’s participation in ISA-led deep-sea exploration balanced economic ambitions with ecological accountability? Critically evaluate the structural limitations of institutional frameworks governing seabed mining.
Practice Questions for UPSC
Prelims Practice Questions
- ISA regulates mineral exploration beyond national jurisdictions under the UNCLOS 1982 framework.
- India’s ISA exploration contracts require compliance with environmental protocols referenced under Section 5 of the 1994 Agreement.
- ISA’s Draft Exploitation Regulations have been fully adopted with detailed biodiversity safeguards, removing major environmental concerns.
Which of the above statements is/are correct?
- PMS deposits are associated with hydrothermal vent habitats, and mining can risk disturbing fragile deep-sea ecosystems.
- Compared to polymetallic nodules, PMS is described as having higher concentrations of economically relevant minerals, potentially offering an advantage.
- Operational feasibility is eased in the Carlsberg Ridge because extraction occurs at shallow depths, reducing costs substantially.
Which of the above statements is/are correct?
Frequently Asked Questions
Why is India’s Carlsberg Ridge ISA contract considered a departure from its earlier seabed exploration efforts?
It marks India’s first exploration of polymetallic sulphides (PMS) in international waters, unlike earlier ISA engagements focused on polymetallic nodules in the Central Indian Ocean Basin. It also signals a shift toward the western maritime frontier in the Arabian Sea region, which had been less central to India’s resource strategy.
What makes polymetallic sulphides strategically and economically attractive compared to polymetallic nodules?
The contract targets PMS deposits associated with industrial metals like copper and zinc, and also gold and rare-earth elements, which are highlighted as strategically important. The article notes PMS typically has higher mineral concentrations than nodules, potentially improving economic viability per unit of extraction.
How does the International Seabed Authority (ISA) regulate seabed mineral exploration beyond national jurisdictions?
ISA, established under UNCLOS 1982, regulates mineral exploration in areas beyond national jurisdiction while balancing extraction with environmental preservation. India’s contract must comply with strict environmental protocols referenced under Section 5 of the 1994 Agreement, reflecting ISA’s duty to protect the “common heritage of humankind.”
What operational feasibility challenges does the article flag for India in the Carlsberg Ridge PMS exploration?
Exploration costs can be very high—up to USD 1,000 per tonne as cited—because of deep operating conditions, with depths exceeding 3,000 m in the region. The article questions whether the Deep Ocean Mission outlay of nearly ₹4,077 crore and currently limited-scope pilot studies are sufficient for scaled, technology-intensive operations.
What environmental and regulatory concerns are raised about deep-sea mining in PMS-bearing areas?
Deep-sea mining may disturb fragile marine ecosystems, especially hydrothermal vent habitats where polymetallic sulphides form. Although ISA oversight exists, the Draft Exploitation Regulations are described as not fully adopted and insufficiently specific on biodiversity protection, creating a regulatory lacuna and potential ecological backlash.
Source: LearnPro Editorial | Environmental Ecology | Published: 16 September 2025 | Last updated: 3 March 2026
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