Tokyo Is Preparing for Floods 'Beyond Anything We've Seen' - The New York Times

Japan has spent billions on an underground system to control water around the capital, but some fear that the city is vulnerable as global warming brings more extreme weather.

Linked by tunnels that divert water away from the region’s most vulnerable floodplains, the $2 billion underground anti-flood system, completed in 2006, is an extraordinary example of the defenses that global cities are readying as they face an era of extreme weather brought on by climate change.