Bouygues TP biuld Twin-tube subsea road tunnel.

Under a 35-year public-private-partnership deal, design and construction of a double sub-sea road tunnel (2 x 1100 m) aimed at relieving traffic congestion on the roads leading to the Port of Miami.

The TBM uses a new excavation method, the Water Control Process (WCP), i.e. excavation without ground confinement, simply by balancing water pressure. When it is discharged from the face by the screw conveyor, the spoil falls into a sort of giant mixer bowl fitted with a crusher where it is ground to a reduced size so it can be mucked out by the conventional hydraulic process

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