Alongside SUBTERRA recently for the completion of a second HDD crossings that will enable the municipality of Sète to reinforce the town’s wastewater network.
- HDD # 1 : DN 630, 460 m – completed in late 2024, beneath a road and the Sète train station car park.
- HDD # 2 : DN 630, 700 m – fully curved, now completed, running under the same car park and the canal, to connect to the pumping station.
A complex environment — limited working space, dense urban surroundings, and heavy traffic — added significant challenges to the project. In addition, the uncertain elevation of the marl-limestone substratum and the instability of surface shell sands called for careful monitoring.
OPTIMUM provided daily support throughout the project, offering real-time technical recommendations and proposing operational adjustments, thanks to advanced modelling and the specialised knowledge of its engineers. HDD works are now finished.
A big shout out to SUBTERRA’s drilling team for their perseverance
