Old Elbe Tunnel or St. Pauli Elbe Tunnel (DE: Alter Elbtunnel or St. Pauli Elbtunnel) (opened 1911), 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 tubes with 6 m (20 ft) diameter connect centr...