Use of advanced tunnelling and station construction methods like those used in the Madrid Metro Line 7 extension.

A total of 4 stations were built, including the Guzmán el Bueno cavern station, which was constructed using the German method for tunnel boring, and which is completely integrated with the city, beneath a dense urban area.


  • Location: Madrid, Spain.
  • Contract type: Design and construction.
  • Infrastucture: Length: 4,650 m, of which 3,435 m were a 9.38-m diameter tunnel.
  • Year of project completion: 1998