The options include enlarging the drill hole or digging a new shaft.
现在的方案有两个：一是扩大现有的通道，二是钻一个新的通道。
The drill may have hit a sealed shaft, away from the miners.
钻孔机在一个密封的通风管道前受阻，而这个管道离矿工们还很远。
Application of inverse well drill will permit quick and safe excavation of pilot shaft.
应用反井钻机开挖导井可达到快速安全的效果。
Application of inverse well drill will permit quick and safe excavation of pilot shaft.
应用反井钻机开挖导井可达到快速安全的效果。
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