A wall in an area with very few areas with large populations is a much more straightforward project than building a tunnel under the water in a place that has some of the most expensive real estate in the world.You can safely bet that whatever the tunnel's estimate, it will eventually cost at least double that with significant scheduling delays.
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"But don't ask me what I think of you, I might not give the answer that you want me to. "
Fleetwood Mac, Oh Well, Part 1 (1969)
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