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The Seikan Tunnel in Japan holds the record for being the longest tunnel with an underwater portion globally. It spans a total distance of 53.85 kilometers (33.4 miles), with about 23.3 kilometers (14.5 miles) passing under the seabed. The Seikan tunnel, situated under the seabed of the Tsugaru Strait at …
Read More »The Seikan Tunnel is the longest tunnel in the world that passes under the sea. The archipelago of Japan
