The Old Elbe Tunnel, also known as the St. Pauli Elbe Tunnel, is an engineering marvel built in the early 20th century beneath the Elbe River in Hamburg, Germany. Opened in 1911, it was originally designed for pedestrians, cyclists, and vehicles, providing a convenient connection between central Hamburg and the docks and shipyards on the south side of the river. This historic tunnel, with its well-preserved Art Nouveau tiles and massive elevators, offers visitors a unique glimpse into Hamburg's industrial past.