Shaft construction for Barcelona TBM On 01.02.2011 construction of the 25.3 m-long, 17.4 m-wide, 26.8 m-deep TBM exit shaft began at the intersection of routes Entenca and Provenca street in Barcelona. The 11.5 m-diameter Herrenknecht TBM Barcino driving the 5.6 km-long tunnel between Sants and La Sagrera stations on the high-speed line Madrid-Barcelona-French border will arrive at the shaft for dismantling and removal. Click es/20, here and here. 06/11.