Crabs Discovered Under Driveway (read explanation)

From YouTube: 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.

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