총공사비 2.7조 한국이 성공해낸 세계적으로도 유례가 없는 난공사. 바다 밑에 깔려있는 뻘밭 위에 72만 톤 왕복 4차선 콘크리트 터널 올려놓기｜거가대교 터널｜극한직업｜#골라듄다큐

What if 18 massive concrete tunnel segments—each the length of ⅔ of the 63 Building and weighing 47,000 tons—were buried under the sea, not built on land? That unimaginable engineering feat became reality in Korea with the construction of the Geoga Bridge Immersed Tunnel, connecting Busan’s Gadeokdo to Geoje Island. Faced with deep ocean currents, a 30-meter mud seabed, and the need to avoid disrupting a key military naval route, engineers used an immersed tube method—never before attempted at this scale in Korea. It took extreme precision and resilience to stabilize the soft seabed with gravel, craft each segment in a 40,000-pyeong dry dock, and submerge them using custom-built equipment. Divers worked under intense pressure and limited time, risking decompression sickness while placing stones by hand on the ocean floor. Even on the surface, every stage—from concrete pouring to towing 180m-long segments—was a race against unpredictable weather and mechanical failures. Delays, disasters, and dangerous conditions were constant, yet the crew pushed on. With a total construction cost of 2.7 trillion won, the Geoga Bridge became not only Korea’s first immersed tunnel but also one of the most difficult engineering projects in the world. This is the untold story of those who risked everything to challenge the sea itself. Program Title: Extreme Jobs – Geoga Bridge Construction Site, Parts 1 & 2 Air Date: April 2, 2008 #ExtremeJobs #GeogaBridge #ImmersedTunnel #EngineeringMarvel #UnderseaTunnel #KoreanInfrastructure #ConstructionLife #MegaProject #Busan #GeojeIsland #PICKDOCU