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Australia: Melbourne metro Tunnel faces cost blowout on early construction work, watchdog reveals

Melbourne metro construction costs are already  31% over in the early phases of project. 31%!

So far $476 million, was approved but the expected expenditure is $625,5 million!

For the total cost of the metro project $11 billion was forecast. So, if you apply the 31% cost overrun to the whole project....

Interesting read as an example of how tunnel projects can go wrong: