The Nicobar Islands and India’s Eastern Defence

The Nicobar Islands sit at the southeastern edge of India, close to the western approaches of the Malacca Strait and the wider sea lanes linking the Indian Ocean with Southeast Asia. Their position gives New Delhi a valuable vantage point over commercial shipping, naval movement, undersea infrastructure and the maritime approaches to the Bay of Bengal.

For Australia, this geography matters well beyond India’s immediate neighbourhood. Ships serving Darwin, Perth, Brisbane and Sydney operate within an increasingly connected Indo-Pacific trading system. Stability around the Nicobars supports Australian energy, resources and manufactured exports, while stronger India–Australia cooperation can improve maritime awareness across a region shaped by trade, strategic competition and civilisational links.

Strategic factor	Importance for India	Relevance to Australia
Location near Malacca approaches	Supports surveillance of vital shipping routes	Protects trade links between the Indian Ocean and Asian markets
Air and naval facilities	Enables quicker response across the eastern Indian Ocean	Strengthens coordination with the Australian Defence Force
Island geography	Creates a forward position for maritime domain awareness	Helps monitor routes connecting Darwin with Southeast Asia
Ecological sensitivity	Requires carefully managed infrastructure	Offers scope for sustainable defence and logistics practices
Regional partnerships	Connects India with ASEAN, Japan and Australia	Supports a more resilient Indo-Pacific security network

A natural eastern shield

The Nicobar chain forms the southern part of the Andaman and Nicobar Islands, extending towards Indonesia. Great Nicobar is especially significant because it lies close to the western entrance of the Malacca Strait, one of the world’s busiest maritime corridors. A large share of Asia’s fuel, containerised goods and industrial inputs passes through waters connected to this route.

Geography does not automatically create military power, but it can reduce response times and improve situational awareness. Radar stations, patrol aircraft, unmanned systems, naval vessels and secure communications can work together from island locations to identify unusual activity. This gives India a stronger eastern flank without relying solely on distant mainland bases.

The position also complements India’s wider maritime strategy, including the “Act East” policy and its security relationships with ASEAN members. The islands can support humanitarian assistance, disaster relief and search-and-rescue operations as well as conventional defence. That broader role is important in a region regularly affected by cyclones, earthquakes and tsunamis.

Protecting sea lanes and critical infrastructure

The Malacca Strait is not the only concern. The Andaman Sea, Bay of Bengal and eastern approaches to the Indian Ocean contain shipping routes, fibre-optic cables, energy infrastructure and port connections that underpin modern economies. Disruption could affect fuel prices, insurance premiums, delivery schedules and industrial production across Asia.

India therefore needs a layered maritime surveillance network rather than a single heavily armed outpost. Coastal radar, satellite data, automatic identification systems and information-sharing arrangements can reveal patterns that individual platforms may miss. Cooperation with Australia, Singapore, Indonesia, Japan and France would give these systems wider reach.

For Australian businesses, the effect is tangible. Iron ore and energy shipments from Western Australia, container traffic through Melbourne and Sydney, and growing commercial links with India all depend on predictable maritime access. Even Australia’s LNG and critical-minerals markets are exposed to delays along Asian sea routes, making the Nicobars relevant to economic security as well as defence planning.

Facilities, mobility and deterrence

India has expanded its military presence in the Andaman and Nicobar region through the tri-services command at Port Blair, naval assets, airfields, jetties and surveillance infrastructure. The Nicobar group, including the facility at Campbell Bay, can support patrols and provide a forward operating location closer to the eastern Indian Ocean.

The most useful capability is mobility. Runways able to handle transport aircraft, helicopter support, fuel storage, maintenance areas and all-weather communications would allow India to move personnel and equipment rapidly during a crisis. These assets also help deliver relief after a cyclone or tsunami, when island communities may otherwise be isolated.

Infrastructure must be resilient rather than merely large. Salt corrosion, monsoon weather, seismic risk and long supply lines raise operating costs. Defence planners should combine hardened facilities with distributed sites, renewable power, reliable water systems and stockpiles of essential materials. Circular-economy planning can reduce waste and lower the environmental burden of construction and long-term operations.

Ecology and the limits of expansion

The Nicobars contain rainforests, coral reefs, mangroves and habitats for rare species. Great Nicobar is also home to indigenous communities whose rights and livelihoods require serious protection. A defence policy that ignores these realities could create social opposition, ecological damage and strategic vulnerability.

Environmental safeguards should therefore be treated as part of national security. Environmental impact assessments, carefully selected transport corridors, limits on dredging and strong disaster planning can reduce the risks of rapid construction. Local consultation is especially important where roads, ports or airfields may affect forests, fishing grounds and customary land.

Australia’s experience offers relevant comparisons. Northern Territory communities understand the practical pressures created by remote infrastructure, while the Australian Defence Force has developed logistics systems for austere environments. Lessons from Darwin and the Tiwi Islands should not be copied mechanically, but they can inform approaches to consultation, water management, habitat protection and supply resilience.

An opportunity for India–Australia cooperation

The Nicobars could become a practical platform for India–Australia maritime cooperation. The two countries already conduct naval exercises and share an interest in a free, open and stable Indo-Pacific. Better coordination could include information fusion, hydrographic knowledge, anti-submarine awareness, joint disaster response and training for sea-lane protection.

Australian engagement should complement India’s leadership in its own maritime neighbourhood. Canberra can contribute surveillance expertise, logistics experience, oceanographic research and capacity-building, while New Delhi provides geographic reach and detailed knowledge of the Bay of Bengal and Andaman Sea. Cooperation with Indonesia and ASEAN would make this framework more inclusive and less dependent on any single alliance structure.

The partnership also has an intellectual dimension. Strategic policy must be grounded in an understanding of India’s civilisational outlook, sovereignty and national cohesion rather than reduced to short-term military transactions. A balanced reading of Indian nationalist thought helps explain why territorial integrity, cultural confidence and independent decision-making remain central to Indian security thinking.

A long-term eastern strategy

The Nicobar Islands should be developed as part of an integrated maritime system connecting defence, commerce, environmental stewardship and regional diplomacy. Their value lies in combining early warning, rapid response and logistical access with the restraint needed to protect fragile island ecosystems.

For New Delhi, this means sustained investment in surveillance, air and naval mobility, secure communications and local resilience. For Canberra, it means recognising that developments near the Malacca approaches can influence Australian shipping, fuel security and Indo-Pacific influence. Australian exporters, from Perth’s resources sector to manufacturers in Melbourne and food producers supplying Asian markets, benefit from dependable sea lanes.

The practical takeaway is clear: India should build a resilient, environmentally responsible and networked security presence in the Nicobars, while Australia should treat cooperation there as part of the wider protection of the Indo-Pacific maritime system.