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In 1971, a railway strike stopped circus animals from
             reaching New York City by train. So, instead, 19 elephants
             walked through the Lincoln Tunnel to get to their show!


                                                                         THE SHOW
                                                                        MUST GO ON!



















             Japan’s Seikan railway tunnel is one of
             the world’s deepest underwater tunnels.
              At 460 feet (140 m), it’s deeper than the
              height of Egypt’s Great Pyramid.








                                                                  Constructing tunnels

             In the engineering world,                            often includes blasting
             building a tunnel is                                 hard rock with explosives
            called driving.                                       and digging dirt with
                                                                  huge machines.



                           SO, IF YOU’LL             DON’T YOU MEAN
                          JUST LOOK AT                THE DRIVING
                          THE BUILDING                  PLANS?
                            PLANS . . .










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