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.