Tunnelling to restart on Sydney motorway, two years after sinkholes halt work

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

M6 motorway resumes after two-year standstill; $3.1bn Sydney project opens 2028 with contractor absorbing costs from 2024 sinkholes. Inadequate preliminary due diligence on major infrastructure contracts creates disputes and delays—contractor risk allocation shapes project viability in tech partnerships and vendor agreements.