’64 kilometers of tunnel sitting 50 meters beneath the surface’

'64 kilometers of tunnel sitting 50 meters beneath the surface' - November 23, 2004
Via BoingBoing: The G-Cans Project is a massive project, begun 12 years ago, to build infrastructure for preventing overflow of the major rivers and waterways spidering the city (A serious problem for Tokyo during rainy-season and typhoon season). The underground waterway is the largest in the world and sports five 32m diameter, 65m deep concrete containment silos which are connected by 64 kilometers of tunnel sitting 50 meters beneath the surface... Japanese-language site
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