Summarize this content to 2000 words in 6 paragraphs Video: How mega rail tunnels were carved out under SydneyHow mega rail tunnels were carved out under SydneyWe’re sorry, this feature is currently unavailable. We’re working to restore it. Please try again later.DismissSkip to sections navigationSkip to contentSkip to footerEngineers were confronted with monumental challenges building a twin rail line for driverless metro trains under the heart of the city.August 8, 2024 — 6.05am
