NHIDCL Assam Underwater Road cum Rail Tunnel Tender 2025

The National Highways & Infrastructure Development Corporation Limited (NHIDCL) has announced a major tender invitation for the strategic construction of a 4-Lane Twin Tube Road cum Rail Underwater Tunnel underneath the River Brahmaputra in Assam. This mega infrastructure undertaking aims to revolutionize transport connectivity by combining road and railway networks inside underwater tube systems. Qualified engineering firms, heavy construction consortia, and infrastructure developers are invited to participate in this landmark project.

Quick Overview

• Project Name: Construction of 4 Lane Twin Tube Road cum Rail Underwater Tunnel
• Organization: National Highways & Infrastructure Development Corporation Limited (NHIDCL)
• Category: Tender / Heavy Infrastructure
• Location: Assam (River Brahmaputra Region)
• Key Infrastructure: 4-Lane Approaches, Twin Tube Tunnel, Integrated Railway Track Setup
• Selection Mode: Technical & Commercial Bidding

Tender Details

This initiative entails the design, engineering, and execution of an underwater tunnel system beneath the Brahmaputra River. The project incorporates twin-tube construction techniques to house both 4-lane highway transport and dual rail infrastructure within one of the tubes, establishing a critical strategic connection in Assam.

Scope of Work

• Construction of a 4-lane twin tube underwater tunnel underneath the River Brahmaputra.
• Development of 4-lane surface approaches connecting both riverbanks.
• Laying and integrating dedicated railway infrastructure within designated tube compartments.
• Provision of safety, ventilation, drainage, and emergency response infrastructure.

Eligibility Conditions

• Entity Type: Registered infrastructure companies, joint ventures, or specialized heavy-civil contractors.
• Technical Capability: Demonstrated experience in large-scale tunneling, underwater/sub-riverine civil works, or major highway/railway infrastructure construction.
• Financial Capability: Must meet the minimum annual turnover and net worth requirements specified in the tender document.

Documents Required

1. Company Registration Certificates & Joint Venture Agreements (if applicable).
2. Audited Financial Statements for the designated financial years.
3. Technical Experience Certificates of similar tunneling/civil engineering works.
4. Income Tax Returns, GST Registration Certificate, and PAN Card.
5. Bid Security / EMD details as prescribed.

How to Apply

1. Visit the central/state e-procurement portal.
2. Search for the tender using reference number NHIDCL/Assam/Record of Discussion/2025.
3. Download the official bid documents, technical specifications, and guidelines.
4. Complete the technical and financial bid templates as requested.
5. Upload all required credentials and tender fees online before the submission deadline.

Important Dates

• Notification / Record Date: 2025
• Bid Submission End Date: To be specified in detailed portal notice

Important Links

• Official E-Procurement Portal: E-procurement Portal

FAQs

Q1: What is the nature of this project? It is a heavy civil engineering tender for constructing an underwater road-cum-rail twin-tube tunnel beneath the River Brahmaputra in Assam.

Q2: Who is the executing agency? National Highways & Infrastructure Development Corporation Limited (NHIDCL).

Q3: Can individual job seekers apply for this notification? No, this is an official infrastructure tender for construction contractors and engineering agencies, not an individual recruitment notice.