Would you believe it. I imagined Cross Rail was London’s big tunnelling project, with the sewage tunnel along under the Thames next, but there is another huge dig going on in the same ground. London power tunnels are a 32km of deep 3-4m diameter tunnels being built to route 400kV power under London, connecting sub-stations ...
Read full article: Huge London tunnels I have never heard of
from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/huge-london-tunnels-i-never-heard-2017-05/
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