The tunnel is an underground passage (usually), built in an effort to address the growing need for roads, highways and bridges to handle large volumes of traffic. The exact definition of the tunnel has been convulsed several times in the past. Apart from that, the tunnel is the result achieved by a remarkable engineering achievement, with a giant boring holes in the mountains, or put a few meters below the sea lane. Let's look at a strange tunnel in the world.
1. Channel tunnel
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