@captainthomas_officiall: The Old Elbtunnel in Hamburg opened in 1911, and is a pedestrian and vehicle tunnel under the River Elbe. The 426 m long tunnel was a technical sensation; 24 m beneath the surface, two 6 m 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. .#tunnel #hamburg #germany #captainthomas #seafarersarekeyworkers