Praia de Mira Pescanova Sea Outfall
Portugal, Mira

In Mira, 100 kilometers south of Porto, the plan was to build a tunnel from the sea to the interior of the country for one of the largest flat fish companies. The tunnels (inlet tunnel and outlet tunne) were planned for a capacity of eleven cubic meters per second to create optimum conditions for the fish.

To achieve this two AVND machines proceeded to the starting blocks. They each drilled 1,500 meters through the silty sand. The project was brought to a successful conclusion in 2008.

Data Sheet

Country, Location

Portugal, Mira






Soft ground
Silty sand

Tunnelling length

5,700 m

Machine Data

1x AVN Machine:
Diameter: 3,040 mm
Lining method: Pipe jacking
Cutterhead power: 250 kW
Torque: 780 kNm

1x AVN Machine:
Diameter: 3,025 mm
Lining method: Pipe jacking
Cutterhead power: 400 kW
Torque: 160 kNm

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.