What undersea rail tunnel, 33.5 miles long is the longest operational underground railway tunnel in the world ? It was completed in 1988 and connects the islands of Honshu and Hokkaido in Japan.
SEIKAN Tunnel Seikan (tunnel) Seikan Tunnel 青函隧道 Seikan Tonneru 青函トンネル Seikan Seikan tunnel
青函隧道 seikan 青函トンネル seikan tonneru seikan tunnel
seikan tunnel
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SEIKAN Tunnel