BESSAC, a worldwide major tunneling and microtunneling contractor, presents 40 years of experience on tunnel and microtunnel projects. \BESSAC masters all mechanized excavation techniques (microtunneling, EPB TBM, Slurry TBM, air pressurized TBM) and has over 100 km of microtunneling and tunneling experience in about 100 projects in last 5 years. These works were realized in 20 countries on five continents.