Tongyeong Undersea Tunnel
Tongyeong Undersea Tunnel, Undersea tunnel in Tongyeong, South Korea.
The tunnel extends 483 meters beneath the sea surface, connecting mainland Tongyeong with Mireukdo island through a concrete structure 5 meters wide.
Built in 1932 during Japanese administration, this engineering project marked the construction of the first undersea tunnel across the entire Asian continent.
The Chinese inscription at the entrance reads 'Yongmundaryang', expressing the connection between mainland and island through this underwater passage.
The tunnel structure sits 13.5 meters below sea level at high tide and currently serves as a dedicated pathway for pedestrian traffic.
The tunnel remains a testament to early 20th-century engineering, demonstrating the technical capabilities achieved in underwater construction during that period.
GPS coordinates: 34.83420,128.41010
Latest update: September 19, 2025 20:12
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