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青函

青函

青函

1

March 13, 1988: The Seikan Tunnel, the longest undersea tunnel in the world , opens between Aomori and Hakodate , Japan.

1988年3月13日：连接日本本州岛与北海道岛的青函隧道正式通车，成为世界最长的海底隧道。

2

Why It's Unique : At 787 feet below sea level, theSeikan Tunnel is the deepest tunnel in the world .

独特之处：坐落在 787 英尺的海平面下的青函隧道是世界上最深的隧道。

3

Kan-Mon Tunnel and Sei-Kan Tunnel in Japan are typical tunnels constructed by mining method .

日本关门隧道、青函隧道都是典型的矿山法施工的隧道。

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