海底トンネル
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Meanings
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undersea tunnel
A tunnel built under the seabed, such as the Seikan Tunnel or the Channel Tunnel.
The Seikan Tunnel is the world's longest undersea tunnel.
undersea tunnel
A tunnel built under the seabed, such as the Seikan Tunnel or the Channel Tunnel.
The Seikan Tunnel is the world's longest undersea tunnel.