How is the water initially displaced? And do they float? Attach to the bottom of the body of water?
I was driving through one today in Boston and couldn’t help but wonder. Cheers in advance!
In: 190
Tunnels for San Francisco’s BART system were built in 57 sections on land and sunk into the bay. Once underwater they were connected underwater, any water in the Tunnel was pumped out and the tunnels rest on the floor of the bay, surrounded by sand and gravel.
https://en.m.wikipedia.org/wiki/Transbay_Tube
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