First driverless metro train crosses Sydney Harbour underwater

A driverless metro train has travelled under Sydney Harbour for the first time in what has been described as a "significant moment" for the city.
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Engineers put the new track work to the test early on Friday morning in the first of many test runs for the line.
The twin tunnels run under the water from Blues Point to Barangaroo, forming a part of the bigger Sydney Metro expansion.
After riding the driverless train into the city from Chatswood, Sydney Metro project officer Hugh Lawson said "everything went very smoothly".
"It is a really significant moment," he said.
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