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There’s a lot on when it comes to Sydney infrastructure, but along with the ever-expanding metro project and the city's new international airport, we’re scoring a mega new tunnel underneath the harbour. According to the NSW Government, Sydney’s most ambitious road project just hit a seriously big milestone – quite literally. The Western Harbour Tunnel is edging closer to reality, with the largest tunnel boring machine in the Southern Hemisphere about to begin its journey beneath Sydney Harbour. Named Patyegarang, the first of two mega machines is preparing to carve its way 44.7 metres below Birchgrove Oval, tunnelling towards Waverton after final testing wrapped over the weekend.
For infrastructure nerds – this isn’t your average piece of construction kit. At 15.7 metres in diameter and weighing 4,350 tonnes, these record-breaking machines are the biggest ever assembled underground in the Southern Hem. As they move forward, they’ll install around 13,000 pre-cast concrete segments to line and support the tunnel – essentially building the road as they go.
According to the NSW Government, Patyegarang won’t be working alone for long. Her counterpart, Barangaroo – also named after a notable Aboriginal woman – is hot on her heels, with assembly already 94 per cent complete and tunnelling expected to begin within the month. Once both tunnel boring machines are in full swing, they’ll tackle the final 1.5-kilometre stretch of twin motorway tunnels beneath the harbour, reaching depths of up to 50 metres below sea level. The operation will run around the clock, with 40 workers on shift at any given time.
Wondering what that means for your commute? When the 6.5-kilometre tunnel opens in 2028, it’s expected to significantly ease congestion across some of the city’s busiest routes. The NSW Government is estimating that traffic on the Western Distributor will drop by 35 per cent, while the Sydney Harbour Tunnel and Harbour Bridge could see reductions of 20 per cent and 17 per cent respectively. In practical terms, that’s a smoother, faster connection between the Warringah Freeway, North Sydney and WestConnex at the Rozelle Interchange – and, hopefully, fewer moments spent staring at brake lights.
For now, you can track the machine’s progress in real time over here, and you can learn more about the project (and what it will mean for your commute across the city) over here.
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