Environmental and Social Risks of Vizhinjam Railway Tunnel Project
Experts warn of geological instability and groundwater disruption for the proposed rail tunnel.
1Proposed Tunnel Project Controversy
The Kerala state government plans to build a 10.7-km railway tunnel connecting Balaramapuram to Vizhinjam International Seaport. Costing over ₹1,500 crore, the project aims to provide essential rail connectivity. However, experts and residents are questioning the decision, citing significant environmental and social costs that may outweigh the project's intended economic benefits.
2Geological and Soil Fragility
Dr. V. Nandakumar, a former expert at the National Centre for Earth Science Studies, warns that the alignment passes through geologically weak terrain. The subsurface consists of decomposed lithomargic clay, sand, and inconsistent red soil. These formations are deemed unsuitable for supporting the immense weight of heavy container trains moving through tunnels.
3Groundwater Disruption Risks
The tunnel, situated 30 metres below the surface, acts as an impervious concrete barrier. This structure threatens to disrupt natural east-to-west groundwater flow, potentially causing local open wells to dry up. Given that many residents in the Thiruvananthapuram district rely on these wells for drinking water, the project poses a severe threat.
4Structural Damage and Vibrations
Heavy container traffic through the tunnel is expected to generate significant vibrations. Experts caution that these vibrations could damage buildings located above the alignment, ranging from small houses to large structures. Potential consequences include cracks, land subsidence, and in extreme cases, the total structural collapse of buildings along the 10.7-km corridor.
5Alternative Alignment Possibilities
Critics suggest an alternative overland route through the Pallichal-Mudavoorpara paddy fields. This path is elevation-wise 10 metres lower and avoids densely populated zones. Such an alignment could minimize risks to groundwater and local livelihoods while potentially reducing overall construction and maintenance costs compared to the currently proposed deep-tunneling method under the road.
6Long-term Development Restrictions
The tunnel project could impose long-term restrictions on land use above the structure, including the designated buffer zone. These limitations may affect building permits, property ownership, and transfer rights for millions of residents. Additionally, the disposal of massive amounts of excavated rock and soil presents a major environmental challenge for the region.
7Government Rationale vs Reality
Government officials defend the selection by citing it as the shortest route from existing railway lines to the port. Despite this, they acknowledge that an overland alignment is available. Experts argue that the government failed to conduct comprehensive geological studies before finalizing the route, prioritizing speed over long-term environmental and social stability.
8Call for Project Reconsideration
The project is set to become the country’s third-longest railway tunnel, yet its feasibility remains highly disputed. Experts urge the government to reconsider the proposal in favor of an overland alignment. Establishing economic viability through transparent, expert-led studies is essential to prevent permanent damage to the region's fragile geology and local communities.