Watch | The underground 'Parthenon' protecting Tokyo from floods

A video on Japan’s ‘Parthenon’, a massive underground reservoir built in Tokyo for flood control

The underground ‘Parthenon’ in Japan is a cavernous complex for protecting Tokyo and surrounding areas from catastrophic flooding. It was built in 2006 at a cost of 230 billion yen ($2.2 billion).

This immense structure funnels away and redirects excess water from storm snd typhoons to the Kasukabe flood tank. This is the largest facility of its kind in the world.

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