Discovery Channel - Megabuilders - Madrid's Big Dig

Seizoen: 2 - Aflevering: 3 / 9 - Eerst uitgezonden: 08 januari 2007 - Episode ID: 440307

Under a sweltering sun in the heart of Madrid, Spanish construction workers are working non-stop on the job of a lifetime... the M-30 Madrid project. At a cost of 3.7 billion Euros it is the largest urban tunneling system ever undertaken, and one of the most challenging.