From Newsgroup: uk.transport.london
Millions of people pass under the River Thames each day, by rail, road or
foot. We take it for granted. Just two centuries ago, the idea of going
under the river would have seemed fanciful. Today, there are 20 different
ways open to the public, and at least 25 further tunnels that most of us
can't access.
https://londonist.com/london/maps/how-many-tunnels-go-under-the-thames-a-map
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