Flooded metro station under construction

Leak investigation underwater with professional divers

Investigated area: metro station below water

Leak detection technology: FGM® technology with special underwater chains

Location: France

Description: This was a very challenging and extraordinary project for all companies involved.

Due to the flooding of the entire metro station, all measurements had to be supported by divers. They placed the sensors – mounted on watertight chains –  in approx. 17 m depth on the excavation level in the water without visibility.

The construction site equipment was still inside the flooded station which made it especially difficult for the divers. We investigated the diaphragm walls, the connection between walls and the injection basement and the injection basement itself.

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Outside the station, the measuring computers were operating the sensors in the water
The sensors were mounted on water-proof cables and were positioned inside the station on the excavation level

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building pit enclosure FGM technology leak detection / civl engineering metro station