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no
The Channel is a body of water so the tunnel does not go under towns, but water.
The Tyne River Tunnel is indeed built partly under water. The lowest spot in the tunnel is 85 feet below the high water mark of the river.
With a spade.
Yes. From the water surface to the top of the tunnel at the deepest point is 40 feet.
Hudson River
tunnel 8)
Yes, the Lincoln Tunnel (and the Holland Tunnel) run underneath the riverbed, not under the surface of the water and through the river itself. In other words, they do not run underwater, but under the bottom of the river.
135ft under water.
France and England
The channel tunnel
The Kellerman Tunnel, exact details are ABOVE EYES ONLY>.