Amur River Tunnel
The Amur River Tunnel (Russian: Тоннель под Амуром, during its construction — стройка No.4) is a 7.2 km long railway tunnel on the Trans-Siberian Railway, in Khabarovsk, Russia. It was built between 1937 and 1942 to provide an alternate route for the Khabarovsk Bridge across the Amur River.