Who are we?
Bessac was built upon its dual expertise as both a public works contractor and a manufacturer of TBMs.
For over 50 years, we’ve gained unparalleled experience in both tunnel and microtunnel construction, as well as the design and manufacturing specialized equipment for underground works.
In this section
BESSAC’s Strengths
Highly specialized teams, able to mobilize and respond quickly
A fleet of more than 40 TBMs and MicroTBMs
Strong capacity for innovation
Our history
2025
France’s longest microtunnel record at 1,355 m for the France/Spain Electrical Interconnection
2023
World first: Very low-carbon metakaolin concrete tunnel for Toulouse Metro Line B Connection
2021
World first: Ultra-low carbon concrete microtunnel for the Bonneuil-en-France wastewater treatment plant discharge
2019
France’s record for the largest pipe jacking, with an internal diameter of 3.5m, for a water transfer gallery at the Clichy wastewater treatment plant
2018
Construction of our new headquarters
2017
French record for the tightest curve (R=110m) achieved with a microtunnelling machine for the Livry-Gargan wastewater collector
2015
World first: Implementation of a hydrid tunnel boring machine allowing a switch from pipe jacking to segment lining for the Miami Norris Cut wastewater collector
2013
Winner of the International Tunneling Award with TDM (Tunnel Dismantling Machine), Hong Kong
2009
Triple certification in Quality, Safety, and Environment, and creation of BESSAC ANDINA in Colombia
2004
Concept and manufacture of the first BESSAC EPB TBM for the VL10 Wastewater collector near Paris in France
2001
First subway project for BESSAC, Lot 3, Line B in Toulouse
1995
First international project, BEWAG Utility Tunnel, in Berlin, Germany
1990
SOLETANCHE acquires BESSAC
1985
Concept and manufacture of the first BESSAC compressed-air TBM for Caudéran-Naujac stromwater collector near Bordeaux
1976
Concept and manufacture of the first BESSAC non-mechanized TBM for a pedestrian underpass gallery in Toulouse
1975
Creation of the company BESSAC Jacking & Drilling by Michel BESSAC
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