HELD BY 128 CABLES: How They Joined the Sydney Harbour Bridge in Mid-Air

In the winter of 1930, two halves of the largest steel arch in the world hung over Sydney Harbour with nothing underneath them. Each half was held back by exactly 128 steel cables, looped through tunnels cut into the sandstone. Then the engineers began letting those cables go. This is the full story of how the Sydney Harbour Bridge was built and joined in mid-air: why it couldn't be built like any arch before it, what the 128 cables were really doing, how two creeper cranes climbed the steel as it grew, and what happened on the night of 19 August 1930, when the two halves finally touched. We also honour the people behind it: John Bradfield, Ralph Freeman and Dorman Long of Middlesbrough, site director Lawrence Ennis, the stonemasons of Moruya, the riveting gangs, the families who lost their homes, and the sixteen men who never came home. ⏱️ CHAPTERS 00:00 Two halves over open water 02:17 Why this arch couldn't be built like any other 03:18 A city cut in half 03:55 The engineer who wouldn't let go 04:37 Steel from Middlesbrough 05:12 The towers that hold nothing up 06:07 128 cables and the horseshoe tunnels 07:29 The creeper cranes 08:51 Rivets, the Depression and the Iron Lung 10:25 Letting go: the night of 19 August 1930 13:44 Hanging the deck and the 96-locomotive test 14:50 Opening day, 19 March 1932 15:35 The bridge today 17:46 The people who built it 20:10 Next on Oz Built 🏗️ ABOUT OZ BUILT Oz Built tells the stories behind Australia's greatest feats of engineering: the machines, the people and the impossible numbers behind the builds that shaped a nation. New documentaries every week. 👉 Subscribe so you don't miss the next build: [LINK DO CANAL]?sub_confirmation=1 💬 Did someone in your family work on the Sydney Harbour Bridge, or have you crossed it yourself? Tell us in the comments. 📚 SOURCES & ARCHIVE Historical photographs and film courtesy of State Library of New South Wales, National Film and Sound Archive of Australia Research based on published histories of the bridge and contemporary newspaper reports. ℹ️ NOTE This documentary is a narrative built from the historical record and our interpretation of it, made for education and entertainment. The work shown was carried out in conditions that would never be allowed today; please don't attempt anything similar. The only safe way to climb the arch today is through the official climb operator. #SydneyHarbourBridge #Engineering #AustralianHistory