Published On Oct 28, 2014
Fifty metres under Tokyo lies a subterranean world — 6.4 kilometres of tunnels, water tanks and massive pillars constructed to withstand 200 tonnes of water per second. This engineering marvel built to protect the ever-present threat of Tokyo flooding.
Subscribe to ABC Science YouTube 👉 https://ab.co/2YFO4Go
Australians can watch Catalyst on ABC iview: http://iview.abc.net.au/programs/cata...
This is an official Australian Broadcasting Corporation YouTube channel.
********
Contributions may be removed if they violate ABC's Online Conditions of Use http://www.abc.net.au/conditions.htm (Section 3).