I think a good deal of the tunnel under the English channel has been dug with TBMs. But these last points were dug manually and there you go! Two sides meet each other under the sea!
Dear @Ansh, channel tunnel geology may have been a dream geology for tunnellers but nevertheless, it does not change the fact that, it was a great tunnelling achievement.
It is interesting (but not surprising) that the tunnelers have followed the chalk layer all the way.
It was a grea tunnelling achievement all the way. Definitely!
Image by: Commander Keane [CC BY-SA 4.0]
Looking at the meeting point on the drawing, it looks like the English did the most of the boring and the French just waited!
Uploader of the video I had posted has been barred from sharing (I don't see why people do that, especially when they are not really the owner of the video). I am sharing here virtually the same thing by another uploader.
cover tunnel photo by: Matt Brown from London, England / CC BY
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What an achievement man!
A great leap for the mankind!