A group of civil construction contractors put Invigilo on the cameras they had already installed. The work includes deep shafts and tunnel headings. In the second year, acknowledged safety findings came in 54% below the first.
CIVIL CONSTRUCTION CONTRACTORSDeep excavation, access shafts, tunnel headings. Tens of metres down, off any patrol route, and usually the part of a civil programme with the least supervision per worker.
Most safety systems assume someone can see the work. Below ground that assumption breaks, and the hazards themselves change shape. A supervisor cannot walk a heading, a shaft and a station box inside one shift.
These contractors were running several worksites at once, with different layouts and different subcontractors on each. Five risks came up repeatedly.
Every worksite already ran CCTV, mostly for security and progress photos. Nobody added a camera or pulled new cable. Invigilo took the existing RTSP streams and processed them on site, at the edge. Underground the uplink drops often enough that anything relying on it would be useless.
Full coverage took two months. A single site is usually live inside 24 hours. The difference here was volume: cameras across several concurrent worksites, each needing its zones drawn and its rules set against footage from that specific environment. Underground scenes in particular needed a few weeks of real footage before the thresholds were any good.
Cameras were already in place across compounds, shafts and headings. No new hardware was needed for standard coverage.
Detection runs on site. Alerts keep working through the connectivity gaps that are normal below ground.
An area can be dangerous during a segment lift and ordinary an hour later. Rules are set per zone and switched with the phase of work.
They go to the supervisor responsible for that area, on WhatsApp or Teams, with the clip attached.
The number took a year to move. The change in how supervisors worked showed up much earlier.
Second year of the programme against the first.
An alert goes to the supervisor for that area while the work is still happening, instead of waiting for the next walkaround.
They act on alerts themselves. Clips get used in briefings. Where something keeps happening, they take it to the subcontractor responsible instead of raising it with everyone.
Detection on its own changes very little. What mattered was who got the alert and what they did with it.
Several worksites cannot be covered by walking them. Nights and weekends get the same attention as a Tuesday morning.
Alerts went to the supervisor for that area, with the authority to stop the work.
Every finding has its clip. That is what makes a toolbox talk land and lets a repeat issue be traced to a crew.
When the same thing goes wrong on three headings, that usually points at how the work is set up.
Start with the cameras already covering one shaft or heading. A single site is usually live within 24 hours of access.