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There is a reason that the number of railway-only suspension bridges is almost zero; but, I submit, it could work on principle. However, questions:

  1. Are there any precedents to such a buoyant bridge-tunnel for transport?

  2. What would give the buoyancy? Something like baloons?

  3. How would the watertightness of the tubes be ensured? (Double, triple tube?)

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Mon Dec 21st, 2009 at 03:29:05 PM EST
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