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Another example is the Metropolitan Area Outer Underground Discharge Channel. (Tokyo) This is a complex of five vertical shafts of 30 meters in diameter and 70 meters in depth, which are connected each other by tunnels of 10 meters in diameter and 6.3 kilo meters long, all told. At the end of the channel, there is the symbolic place called 'pressure-adjusting tank' also known as 'Underground Parthenon' which is as large as a soccer ground and measures 18 meters in height.

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Biblical Archaeology - Hezekiah's Tunnel / Siloam Tunnel. Hidden man made tunnel under Jerusalem. Diverted water from Gihon Spring to Pool of Siloam. Giving water while under attack. Dug during King Hezekiah 701 BC. An inscription was found recording the construction...

There's always a light at the end of the tunnel.

Tokyo is protected against flood by gigantic constructions under the ground. They are invisible in our daily life, but they sure help us to remain safe when Tokyo is hit by torrential rain. One such example is the Kanda River Underground Retention Basin made up of 4.5 km tunnel 40 meters under the ground. This underground retention basin can hold up to 540,000 tons of water when Tokyo is hit by flood.