I read this yesterday evening and I would like to share it here. It is great reading.

The article (from Tunnel Business Magazine) is about the Brenner Base Tunnel, the 64 kilometers-long railway tunnel between Austria and Italy.

Apperantly it is being built by a joint venture between Strabag of Austria and Slini Impregilo of Italy. Strabag is responsible for the Technical Leadership and Salini Impregilo for the construction.

Very, very interesting:

https://tunnelingonline.com/brenner-base-tunnel/