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!