Spreetunnel Friedrichshagen, Pedestrian tunnel beneath Spree River in Friedrichshagen, Germany.
Spreetunnel Friedrichshagen is a pedestrian passage running 120 meters beneath the Spree River, connecting Kämmereiheide near Köpenick with Müggelpark in the Friedrichshagen district. The tunnel features renewed lighting and stairways that were installed during a major restoration completed in 2016.
The tunnel was completed in 1927 and replaced the ferry service that previously connected the two riverbanks. Its construction using the compressed air caisson technique made it Germany's first reinforced concrete tunnel built with this pioneering method.
The tunnel serves daily commuters between the neighborhoods and is now part of the E11 long-distance hiking route used by visitors exploring the river region. It connects access points to local swimming areas that remain popular gathering spots.
The tunnel is accessible year-round and offers safe staircases and good lighting for visitors of all ages. Wearing sturdy footwear is advisable since the ground can be slippery in the damp environment beneath the river.
The construction required submerging two separate concrete caisson sections underwater and then joining them with precision, all without disrupting river navigation above. This engineering feat was remarkably challenging for the standards of the 1920s.
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