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大桥局四处潜水班的同志认真学习毛主席著作,,创造了深潜泥浆层的英雄事迹。4020大桥3号墩在紧张的施工中,发生了一个意外的事故:3号孔在施钻中钻头的钨金套突然折断,七吨重的钻头掉入孔底。3号孔
The Bridge Bureau’s diving class comrades conscientiously studied Chairman Mao’s works and created the heroic deeds of the deep-dive mud layer. In the tense construction of Pier 4020, an unexpected accident occurred: No. 3 hole in the drill bit tungsten alloy sleeve suddenly broken, seven tons of drill fell into the bottom of the hole. Hole No. 3