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@cliveo
I am trying to visualise 2 million miles of tunnels. Let’s say that each was a couple of metres wide. They would go round the earth at the equator 50 times.
But London is not 40,000km wide but, at it widest maybe 100km and so instead of 50x 2 metres the width of the tunnels if placed along side each other would be 400,000 m x 50 x 2 or 40,000,000 metres or 40,000km.
Now of course tunnels can sit one on top of another but that would effectively create on rather large hole many many metres deep under the surface of London.
No. I can’t visualise itn