The secrets of a massive centuries-old engineering project are slowly being revealed.

The lost tunnels of Liverpool

A vast network of 200-year-old tunnels lies beneath Liverpool’s streets – and no one knows why they’re there. Chris Baraniuk meets the dedicated volunteers digging up their secrets.

from FB-RSS feed for ASME (American Society of Mechanical Engineers) http://www.bbc.com/future/story/20150902-the-lost-tunnels-of-liverpool

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