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New Scientist - A Last Word question - Living dead crabs

The Last Word question - the living dead While digging over a driveway, some workmen I know came across 13 living crabs. They were in a small, sealed chamber around 25 centimetres below the surface of the drive, which was surfaced with sand and gravel over a subsoil of pure sand and laid about 80 years ago. There have been no excavations on the site for at least 40 years. Most of the crabs are around 7 centimetres across, and a barnacle on the shell of one suggests they came from the sea. The nearest seawater - an estuary - is around 4 kilometres away and the sea itself considerably further. A few are now living happily in a water butt. How did they survive where they were discovered? Question submitted by Peter William-Eaves and video taken by Mark Leitch For more see: http://www.newscientist.com/lastword.ns
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