Comment on "The first RECTANGULAR Tunnel Boring Machine (TBM)!"
Although the area cut is rectangular, the cutting is still done circularly though. OK that is not surprising. But I don't get it. The small cutting heads do not cover the whole surface. Or is it me missing something?Comment on "A Great Moment of Tunnelling from way back: 1 December 1990 EUROTUNNEL Breakthrough!"
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 achievem...
cover tunnel photo by: Matt Brown from London, England / CC BY
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