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National Route 77 connecting Paju and Busan. The only section that was disconnected was the Boryeong-Taean section. The longest undersea tunnel in Korea that connects the two disconnected regions. Let's take a look at the technology and know-how of Hyundai Engineering & Construction, which completed 125 tunnels, a total of 298 km, over 75 years.💁🏻♀