From: root@mauve.demon.co.uk   
      
   junk@electrosphere.org wrote:   
   > Can someone think off the top of their head of suitable materials for   
   > use as reentry shielding/ external shell material that are compatible   
   > with either a fresh water or salt water environment after reentry?   
   >   
      
   Niobium/Californium.   
      
   Very inert, essentially totally to sea and salt water.   
      
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