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Originally Posted by OhioGuy
^^ A floating underwater tunnel? So something that doesn't rest on the ground, but instead is somewhere in the middle between the surface and ocean floor? Doesn't sound very safe to me. Even if it's low enough to avoid large ships, whales also enter San Francisco Bay from time to time. What happens if one of them hits the floating tunnel? I wouldn't want to be on a train going through that tunnel at that time.
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I'm too lazy to dig up a link at the moment, but it's been done before. In places like Norway with deep fjords it's cheaper to build a floating tunnel than build a tunnel all the way down to the bottom of the fjord.