Page 1 -
P. 1

Would you walk through a tunnel of bones?   TUNNELS
 Or travel miles down to get to the tunnels of   A tunnel in Malaysia can
                        A tunnel in Malaysia can
                        A tunnel in Malaysia can
                        A tunnel in Malaysia can
                          be filled with water to
                          be filled with water to
                          be filled with water to
 the world’s deepest gold mine? You can take   be filled with water to
                        avoid flooding in the city.
                        avoid flooding in the city.
                        avoid flooding in the city.
 tunnels through glaciers, mountains, and   avoid flooding in the city.
 more! Discover extreme facts about tunnels.
                                                        The Gotthard Base
                                                        The Gotthard Base
                                                      Tunnel in Switzerland
                                                      Tunnel in Switzerland
                                                           is the world’s
                                                           is the world’s
                                                         deepest tunnel.
                                                         deepest tunnel.
 Read all the books in this series:







 Finan
          A  A  A
          A group of 13 villagers dug group of 13 villagers dug group of 13 villagers dug group of 13 villagers dug
            the Guoliang Tunnel in he Guoliang Tunnel in he Guoliang Tunnel in he Guoliang Tunnel in
            t t t
                Ch
                Ch
                Ch
                China—by hand!ina—by hand!ina—by hand!ina—by hand!



 For more X-treme Facts titles, visit our website.







 BearportPublishing.com                             by Catherine C. Finan










                                                                                  4/6/22   2:20 PM
 XF-Engineering-COVERS-FINAL.indd   5                                             4/6/22   2:20 PM
 XF-Engineering-COVERS-FINAL.indd   5
   1   2   3   4   5   6