washington dc

This Giant Mechanical Earthworm Is Fixing One City's Poop Problem

Washington DC is overflowing with crap — and not just the sort spewed in US Congress. Rather, its ancient sewage system regularly overflows, sending a literal river of poo into the city’s waterways. Lady Bird is the name of the giant tunnelling machine sent to stop it.

8 Massive Tunnels Being Built Right Now

Now that we know it was an 20cm steel pipe that brought the world’s largest-diameter tunnelling machine to a halt up in Seattle, we can no longer fantasise about Bertha unearthing a five-storey-tall buried locomotive. But we can look at something almost as fascinating: The other giant holes that are currently being churned through the bedrock below our cities.

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