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
Not sure which one in Boston that you went through, but if it was the Ted Williams (to-from the airport) it was built in sections that looked like binoculars on the surface, and then sunk in place and attached together. https://en.m.wikipedia.org/wiki/Ted_Williams_Tunnel
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