This is an underwater bridge between Sweden and Denmark. Apparently my mom went through one on the East coast. It's basically a passage for ships... but how in the world do you construct one of these? An underwater Caterpillar? Scuba divers that can hold mass amounts of cement? I am baffled.
![](http://i46.photobucket.com/albums/f117/sonrisara/Unknown.gif)
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There may be scuba gear involved. And underwater welding.
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