@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.
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...
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!