| 41. | XU10 blocks are made in cast iron, with bores machined directly in the block, without removable cylinder liners.
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| 42. | In October and November, the two tunnel boring machines ( TBM ), christened Liva and Bette, were delivered.
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| 43. | The crossing under the main railway station is not done by the tunnel boring machine, but by manual digging.
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| 44. | Herrenknecht AG ( Schwanau ) was responsible for the delivery of the two tunnel boring machines ( TBM ).
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| 45. | The curving walls of the corridor still bear the inch-wide grooves where giant boring machines sliced through the rocks.
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| 46. | It is a marvel how they were able to build those tunnels before the advent of Tunnel Boring Machines.
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| 47. | Eleven giant boring machines, guided by satellites, dug the passages from December 1987 to mid-1991, laying concrete lining behind them.
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| 48. | Some people have use well-boring machines, designed to irrigate fields in rural areas, to dig for water in the city.
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| 49. | The bored tunnels have internal diameter of and were driven by a diameter Herrenknecht earth pressure balance tunnel boring machine.
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| 50. | The boring machine has been running into very soft earth, wells, sinkholes and underground caves as it moves under Panepistimiou.
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