The city plans to construct the 62 km Emisor Oriente sewer tunnel. The tunnel will be constructed using a total of six TBMs, including three 8.93 metre diameter Robbins EPB TBMs.

Carso Infraestructura y Construccion, S.A.B de C.V signed a complete contract with Robbins. The three machines are scheduled for an early 2010 launch after design and assembly in the US and China.

The finished tunnel will provide drainage at 150 cubic metres of water per second, easing problems caused by surface subsidence and the city’s increasing population.