Discuss the strategic significance of polymetallic nodules for India's critical mineral security, and the technological and environmental challenges in harnessing them.

Polymetallic nodules are potato-sized lumps on the seabed. They are rich in nickel, cobalt, copper and manganese. In October 2026 the Ministry of Mines put two Andaman Sea blocks covering 1,632 sq km up for auction under a Composite Licence [1]. This shows that India now treats nodules as a strategic resource and not only a subject of research. Getting at them, however, raises hard technological and ecological problems.

Strategic significance

• Critical-mineral security: Ni, Co, Cu and Mn are inputs for EV batteries and emerging technologies. Offshore sources at home reduce dependence on imports [1].
• Two routes to access: India has blocks in its EEZ under the OAMDR Act, 2002, which was amended in 2023 to make auction mandatory [1]. It also holds an ISA contract for about 75,000 sq km in the Central Indian Ocean Basin [2].
• Value addition: a Critical Mineral Processing Park is planned on the eastern coast, so that the ore is processed in India rather than exported raw [1].
• Geostrategy: activity in the Andaman Sea strengthens India's eastern maritime presence. ISA contracts, including a third one for the Carlsberg Ridge (2025), give India a voice in global seabed governance [4].

Technological challenges

• Extreme depth: nodules lie at about 5,500 m. The Deep Ocean Mission is still developing an integrated mining system and the Matsya 6000 crewed submersible [2].
• Slow progress: India's first crewed dive to 5,000 m came only in August 2025, more than two decades after the 2002 contract [3].
• Unproven reserves: bidders must quote a share of the mineral's value before systematic exploration has been done. NMEDT repays only part of their exploration costs [1].
• Processing gap: there is still no commercially proven way to extract metal from nodules, and the processing park exists only on paper [1].

Environmental challenges

• Rules come after the auction: the terms of reference for baseline environmental data and the Environmental Management Plan guidelines were still drafts during bidding [1].
• Fragile ecosystems: nodule fields grow very slowly. Damage to seabed habitats may be irreversible, and without a baseline it cannot be measured.
• Existing safeguards: bidders must get all consents before exploration or production begins, and the blocks exclude notified Marine Protected Areas [5].

Polymetallic nodules can give India a secure supply of critical minerals. That value depends on mastering the technology and protecting the ecology. India should make the baseline survey rules final and binding before licences are signed. It should share Deep Ocean Mission data through GSI to lower exploration risk, and time the processing park to match the licences. Done this way, India can pursue its Blue Economy ambitions in line with SDG 14 (Life Below Water).