India’s ₹91,000-crore Great Nicobar island infrastructure project faces significant engineering challenges due to its location in a high-risk Seismic Zone V area. Experts highlight the necessity of advanced structural solutions to mitigate threats from earthquakes, tsunamis, and land subsidence before construction begins by 2028.
India’s plan to transform Great Nicobar Island into a global maritime hub is progressing, but the Rs 91,000-crore project faces serious geological obstacles. The proposed infrastructure, which includes an international transshipment terminal and an airport, is situated in Seismic Zone V, the highest risk category for earthquakes in India. This location makes the site prone to major seismic activity, which remains a primary concern for the project's long-term stability and safety.
Geological and Seismic Challenges
Research, including studies conducted by IIT Kanpur, has pointed to a history of significant seismic events in the region. Evidence shows that the island has experienced major tsunami events over the past 8,000 years. Geologists have noted that the tectonic strain accumulating in the area could potentially trigger large subduction zone earthquakes. Furthermore, the island is vulnerable to co-seismic subsidence, a phenomenon where land permanently sinks during a seismic event. This was documented during the 2004 tsunami, when parts of the island dropped by several feet, permanently altering the local landscape.
Engineering and Infrastructure Resilience
To address these risks, engineering teams are planning to incorporate specialized construction techniques. Plans include reinforcing water-logged and unstable soil using stone columns and vertical drains, which helps prevent soil liquefaction—a process where solid ground temporarily behaves like a liquid during shaking. Additional measures, such as deep-driven steel and concrete pillars, are intended to anchor essential structures directly into the more stable bedrock.
For maritime infrastructure like docks and jetties, designers are looking at flexible, floating structures capable of adjusting to land subsidence and changing sea levels. Planners also intend to use wave deflectors and artificial reinforcements to reduce the force of potential tsunami surges. While these designs aim to protect the infrastructure, engineers face the added difficulty of executing these complex projects in a remote location.
Operational Risks of Isolation
Unlike projects located on the Indian mainland, Great Nicobar is geographically isolated. This remoteness complicates the deployment of emergency supplies, backup power systems, and maintenance teams during a crisis. Experts note that even with advanced engineering, the inability to quickly access mainland support systems remains a unique operational risk for high-tech infrastructure in such a remote setting. The success of this massive project will depend on how effectively these specialized designs can perform under real-world conditions over several decades. Investors and stakeholders will likely monitor the progress of technical feasibility reports, environmental clearances, and the finalization of construction designs as the 2028 target for ground construction approaches.