Quickly Jimmy flashed the gleams of his small lamp over the cracked and broken walls of the dugout. At first he had no success, but finally he found what he was looking for.
"Here it is!" he cried. "An old door! It's been closed for some time, but here it is."
"Can it be opened?" asked Roger.
"That remains to be seen," replied Jimmy, as he limped nearer to it, for he had been struck on the leg by a piece of timber and he was painfully lame.
An examination showed that the door, though broken and jammed, was capable of being forced open. This was done by Roger and Jimmy, using pieces of planks for levers. At last the broken door swung to one side on its burst hinges, and beyond it a dark tunnel was seen.
"Here's the place!" cried Jimmy. "Now if we can go along this until we reach the other bomb-proof we shall get out all right."
"Yes—if we can," said Roger significantly. "Well, we've got to try, that's sure. Can't stay here very long. It may come down about our ears."
"I don't know about Iggy, though," went on Jimmy. "Of course we could carry him, but it would be hard work."
However, they were not compelled to do this. For when Roger and Jimmy went back to where they had left Bob and Franz looking after the wounded Polish lad, they found that Iggy could walk by leaning on the shoulder of someone.
"That's good!" exclaimed Jimmy. "Now then for the tunnel! But take it easy, everybody. We may be going into a blind lead, or a place worse than this. So go slow!"