                                                                                                                                                                                                                                                                                                                                                1908 6 30                             1000km                   2000km2      1500              970km           5000km   4 14           8                                            1917                                                                                                                                                   1958          1908                                        3540km                                                                                 400  TNT        200                
                                                                                                                                               
                                                  
                                                                                                                                                                                                                                                                                       