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The Channel Tunnel is really three parallel tunnels (two rail tunnels and a central service tunnel). It was bored through a thin, curving layer of chalk marl under the seabed, and the video's main point is that the ha...
Unknown · 0:00
The Channel Tunnel is really three parallel tunnels (two rail tunnels and a central service tunnel). It was bored through a thin, curving layer of chalk marl under the seabed, and the video's main point is that the ha...
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