tunneller       
noun [ C ] UK (US tunneler) uk/ˈtʌn.əl.ər/ us/ˈtʌn.əl.ɚ/
 隧道工
someone that digs a tunnel (= a long passage under or through the ground)
  Tunnellers have worked under pressure before, but never in such unstable ground conditions. 隧道工以前曾在压力下工作,但从未在如此不稳定的地况下工作。 
 The tunnellers cannot use a machine like the ones used in the Channel tunnel work. 隧道工不能使用像英吉利海峡隧道工程中使用的机器。 
 See: tunnel
 - More examples
 - Land Rovers patrol the site to deter tunnellers burrowing their way in.
 - The tunnellers map the length and direction of the tunnel using satellite pictures.
 - Specialist cavers and tunnellers now have to dig alongside them.