Youngest Tube
Ironically, the newest tubes must withstand the oldest problem: water. Seabed tunnels (like the new Sydney Metro extension) and flood-panel systems are standard on any train network claiming the "youngest tube" title.
Ironically, the newest tubes must withstand the oldest problem: water. Seabed tunnels (like the new Sydney Metro extension) and flood-panel systems are standard on any train network claiming the "youngest tube" title.