Constructed by Bouygues Travaux Publics in the context of the major projects carried out in preparation for the Sydney Olympics in 2000, this 10-kilometre metro line, of which 9 kilometres are underground, provided the city with a major infrastructure. The works on this tunnel beat all records in Australia: at the time of construction, it was the longest tunnel ever driven on the continent, the biggest-diameter TBM used and the first use of a slurry-shield machine. With four new metro stations, the line has been a key addition to the city’s public transport services. It is used by more than 11 million passengers annually.