St. Pauli-Elbtunnel / Alter Elbtunnel

St. Pauli-Elbtunnel, also named Alter Elbtunnel in Hamburg

The tunnel opened in 1911 and is a pedestrian and vehicle tunnel in Hamburg, Germany. The 426 m (1,398 ft) long tunnel was a technical sensation; 24 m (80 ft) beneath the surface, two 6 m (20 ft) diameter tubes connect central Hamburg with the docks and shipyards on the south side of the river Elbe. This was a big improvement for tens of thousands of workers in one of the busiest harbors in the world.