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Sydney’s ‘unbuildable motorway’ to be completed after two-year delay caused by sinkholes

State government and consortium strike deal to complete M6’s twin tunnels with minister insisting there is ‘no extra cost to NSW taxpayers’ Get our breaking news email , free app or daily news podcast Tunnelling on…

1 report1 sourceJun 19, 2026, 6:40 AM
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The GuardianJun 19, 2026, 6:40 AM

Sydney’s ‘unbuildable motorway’ to be completed after two-year delay caused by sinkholes

State government and consortium strike deal to complete M6’s twin tunnels with minister insisting there is ‘no extra cost to NSW taxpayers’ Get our breaking news email , free app or daily news podcast Tunnelling on Sydney’s $3.1bn M6 project, dubbed the potentially “ unbuildable motorway ”, will resume after the state government struck a deal with contractors, ending a two-year stalemate during which works were halted. Under the terms of the new agreement, the private consortium will absorb the costs of finishing the tunnels, limiting the financial hit to taxpayers. Continue reading...

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