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  1. I imagine there are plenty of vibrations in km tall drilling platforms.

  2. But the Marmaray is meant to sink!  As I suggested to JakeS, his (indirect) suggestion of ferrocement is very appealing, given its lightweight, toughness, and proven record with maritime applications.  There are 100 year old boats still floating in the sea.  AAC (aerated concrete) with a ferrocement outer would be even better, given its positive natural buoyancy.  We know that positive buoyancy is possible, given that there are ships that carry trains.  It's then just a question of diameter and materials choice.
by njh on Tue Dec 22nd, 2009 at 06:34:08 PM EST
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