该地区不可预知的地质环境和火山岩结构迫使工程师放弃使用钻孔机，而是通过爆破在津轻海峡挖掘出一条通道。
Theregion's unpredictable geology and its volcanic rock prevented engineers from using boring machines, forcing them to blast and dig their way under the Tsugaru Strait.
负责营救任务的工程师表示，他们将用重型钻孔机在圣何塞金铜矿开挖一个新矿井，而开挖工程至少需要120天。
The engineer in charge of the rescue operation said a more powerful drill would be needed to dig a new shaft at the San Jose gold and copper mine, and the dig would take at least 120 days.
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