•  Location

    Myeongil-dong, Gangdong-gu, Seoul ~ Godeok-dong, Gangdong-gu, Seoul 

•  Description
• Total L = 1,289.6m
• Tunnel L = 861.6m
• Open Tunnel L = 44.1m
• 2 Station L = 383.9m
• Transfer passage L = 168.5m

• Technical Issue              
• The measures to secure the safety of Seoul-Sejong Expressway tunnel parallelling Metro Line 9

• Establishment of measures to ensure the separation distance and safety of Line 5, crossing directly above Line 9                

• Selection of a excavation method to minimize the impact of blasting vibrations in urban area