According to Belgian press, following a broken water pipe at Simonis station, a repair had to be performed at Brussels metro tunnel. And it seems it quickly turned into a Belgium-style language war. STIB (Brussels Public...

Recycling is good for the environment https://tunnelcontact.com/discussion/view/5477/recycled-herrenknecht-mixed-shield-is-used-in-netherlands-tunnel-project

Traditional insulation and non-combustibility are easily glossed-over topics. Ascertaining what constitutes passive fire protection, as opposed to risk reduction through provision of safe materials near passengers and operators, takes a reasonable...