Seoul has begun construction on a 4.5-kilometer-long, deep-underground drainage tunnel beneath Dorimcheon Stream to mitigate flood risks. The project aims to address concerns about rapidly rising water levels during heavy rainfall, which previously threatened the surrounding area with inundation. This large-scale infrastructure investment is a key component of Seoul’s broader efforts to strengthen its flood defense system. The tunnel will function as a major stormwater drainage channel, diverting excess water away from vulnerable zones. Construction is now underway, marking a significant step in enhancing the city’s resilience to extreme weather events. Officials anticipate the tunnel will substantially reduce the potential for flooding in the Dorimcheon area and contribute to overall urban safety. The project represents a proactive approach to climate change adaptation and disaster preparedness in the South Korean capital.