A leading construction contractor played an instrumental role in building one of India’s most significant infrastructure projects, the Mumbai Trans Harbour Link, known as Atal Setu, the 12th longest sea bridge in the world. The project connects two parts of Mumbai that were previously separated by a long road journey, improving connectivity and supporting economic activity across the region.
The Challenge – Securing a high-stakes site in an unforgiving environment
A project of this scale carries proportionate risk. Any security lapse on site had the potential to delay the completion timeline or compromise the project altogether, which meant the client needed a partner capable of surveying and securing the most critical areas of the site with precision.
The workforce itself added complexity. The site needed to manage access for daily wage workers, engineers and project management professionals simultaneously, each requiring different levels of clearance, while restricting movement into the most sensitive construction zones. Personnel were also stationed and residing on site beneath the bridge itself, which meant access control had to stay stringent without becoming a daily obstacle for people working and living there.
On top of the operational demands, the site sat in a genuinely harsh, ocean-adjacent environment. The client needed a bridge security monitoring system engineered to run without breakdown through salt air, humidity and constant exposure to the elements, for the full duration of the project.
The Solution – Weatherproof access control built for a working coastline
Smart-i deployed smartSLIM, a card and PIN-based access terminal built with an IP65 rating specifically for demanding outdoor conditions. The same rating that lets smartSLIM operate reliably in chemical plants and cold storage facilities made it a practical fit for a site exposed to salt air and monsoon conditions daily, with a tamper-proof enclosure that holds up under continuous use rather than needing special handling.
The system regulated entry for the site’s workforce of around 1,000 individuals, restricting access to designated areas based on role, and connected into Smart-i’s centralised software for continuous oversight of who was moving through the site and when. This gave the client one of the more practical infrastructure security solutions available for a site where conditions change daily but access rules can’t.
The Outcome – Reliable access control through every season
- Entry across the site is restricted to designated zones, keeping daily wage workers, engineers and project management staff within their assigned areas only.
- The system has continued operating through Mumbai’s monsoon and coastal humidity without hardware failures disrupting site access.
- Continuous software-based oversight gives the client visibility into site movement without needing a manual sign-in process at every point of entry.
- The tamper-proof, IP65-rated hardware removed device reliability as a recurring concern for a team already managing a large-scale, high-stakes build.
In Conclusion
For a project of Atal Setu’s scale, critical infrastructure security can’t be an afterthought bolted onto the construction schedule. The client needed a system that would hold up to the same coastal conditions the bridge itself was built to withstand, and that’s what a weatherproof, tamper-proof access terminal running on centralised software delivered across the length of the build.
What this project demonstrates is that Mumbai Trans Harbour Link security worked because the hardware matched the environment. A sea bridge security system built for office conditions would have needed constant maintenance on a site like this one. One built for harsh outdoor conditions is built to last.