nearly five o'clock
The workmen might think it unsafe to mine any further in this part of the glacier , and begin operations at some other point . I did sit down for a moment , and then I rose involuntarily and began my weary round . Suddenly I thought of looking at my watch . It was nearly five o'clock . I had been more than four hours in that dreadful place , and I did not believe that I could continue to exercise my limbs very much longer . The lights I had seen had ceased . It was quite plain that the workmen had no idea that any one was imprisoned in the cave .