What an achievement man!

A great leap for the mankind!

Geology of the channel made it a very easy tunnelling project.

You can see that they can cut the tunnel like cutting cheese.

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!

@Lutz I guess it is a fairly precise comment -:) No doubt the French demanded and got the half the credit though...

@Martin thanks for sharing the great graphics here.

I completely agree that this -in my humble opinion- remains the greatest tunnelling achievement, regardless of geology, chalk whatever. This is the TOP!

The Eurotunnel diggers motto was: FOLLOW THE CHALK

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.