As the rescue operations to evacuate 41 workers trapped in Uttarakhand's Silkyara tunnel in Uttarkashi district entered the thirteenth day on Friday, it faced yet another setback. The auger drilling machine hit a metal girder in the evening, a little after drilling was resumed after officials resolved a technical snag. The 25-tonne machine restarted on Friday evening and drilling resumed. However, a fresh hurdle was faced as the boring continued for about an hour before the drill hit a metal girder. The rescue operation was halted again. The rescue operations entered its fourteenth day on Saturday. An official said the auger drilling machine faced a hurdle, apparently a metal object, a little after drilling resumed Friday, a day after officials had put the operation on hold following technical problems. With one hurdle or the other not letting the auger machine drill further and lay steel pipes through the rubble to prepare an escape route for the trapped workers, the option of manual drilling is being considered, an official said.