Tokyo Bay Aqua Tunnel

An integral part of the Tokyo Bay Aqualine, the Tokyo Bay Tunnel is a 5.9 mile long link between Kawasaki City and Kisarazu City that, along with a 2.75 mile long bridge and a completely artificial island, makes up the Trans Tokyo Bay Highway. The Highway opened in 1997 and saves commuters a tedius 62 mile journey through the congested heart of Tokyo. The shield tunnel has the largest diameter of its kind in the world at 45.5ft for two lanes of traffic as well as vital protection and sturdiness in this highly earthquake prone area.