"How Do They Build Tunnels That Don't Cave In All The Time? Hey, I bet Pop Will Know"
So says young Mike to himself after struggling to build a tunnel in his sandbox. And sure enough, his friend Pop Mechanics does know the answer to Mike's Question. Come along as Mike and Pop learn all about how tunnels are built underwater, through mountains and beneath cities.
-See a gigantic tunnel-boring machine in action as it digs through solid rock!
-Visit an actual construction site where a tunnel is being build 270 feet below the surface!
-Get an up-close look at an awesome conveyer belt that moves 900 tons of rock every hour!
-See amazing computer graphics of a famous tunnel-construction project
AND MORE!
