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Postcard illustrating the Elbe Tunnel in Hamburg, with an aerial view of the port and a section of the tunnel's interior. The reverse details the technical characteristics: construction between 1908 and 1911, length of 450 meters, depth of 21 meters below water level, and capacity for 14,000 people per hour without hindering maritime traffic. Publisher: Conwa Grosso & Co. GmbH, Hamburg.