| 1 | We shall have more rigs in a year. | |
| 2 | Tunnelling machines - Shield machines, thrust boring machines, auger boring machines, lining erection equipment - Safety requirements. | |
| 3 | May operate air-track, rotary, down-the-hole or other drilling machines to drill blast holes or may direct drilling of blast holes. | |
| 4 | A miner climbs on excavated rocks after a giant drill broke through at the final section of the NEAT Gotthard Base Tunnel, Switzerland. | |
| 5 | Disappointingly perhaps, scientists have discovered this not by carrying out an exciting mole-cruiser expedition beneath the planetary crust, but by (comparatively) humdrum lab work. |
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