Boring machines cut through the earth leaving a hole from which workers can assemble a tunnel
AdvertisementInfographicsGoing undergroundReading Time:1 minuteWhy you can trust SCMPAdolfo ArranzPublished: 12:00am, 3 Dec 2011Boring machines cut through the earth leaving a hole from which workers can assemble a tunnel AdvertisementSelect VoiceSelect Speed0.8x0.9x1.0x1.1x1.2x1.5x1.75x00:0000:001.00x
