Fifty Australian archaeologists have begun a bid in Greece to try and solve the mystery of why a bustling early Iron Age city was abandoned.
They're in Zagora, once a city that was thriving with farming and industry on the island of Andros in the 9th century BC before it was inexplicably abandoned.
One of the dig's co-directors is Lesley Beaumont from Sydney University's Department of Archaeology.
Thea Cowie asked her why it's so important to solve the mystery.
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