工程师须要在坚实的岩石中开凿隧道。
在控制室内，物理学家和工程师们小心翼翼地在隧道的一部分将光束击落，在其完成全程之前把它拦截下来。
Inside the control room, physicists and engineers cautiously shot the beam down part of the tunnel, stopping it before it went all the way around.
然而，来自安装在朱比里线内的传感器的数据证实了工程师们所担忧的事，被监测的隧道已逐渐呈现出安全问题。
The data from sensors installed on the Jubilee Line, however, helped confirm engineers' concerns that safety problems were developing in the monitored tunnel.
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