It was simple curiosity that prompted retired Royal Navy diver Chris Murray a decade ago to plunge into the icy waters around a mysterious islet in a small loch on his home island of Lewis in the Scottish Hebrides. But when the extraordinarily well-preserved pottery he found in the islet"s silty surround was radiocarbon dated to 3600 BC, it pushed our awareness of civilization on the British Isles back to a time before both Stonehenge and the first pyramids in Egypt.

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