A group of British tunnelers dig underneath no man's land, from the Allied trenches to the German trenches, and set bombs under the German front in hopes of breaking the deadly stalemate of the Battle of Messines.铜矿位于山体内部偏下100米的地方，最近的山洞离那条铜矿(😘)的(🕒)(de )直线距离(lí )有(yǒu )300米(mǐ )。