"The way we're going. This isn't so hopeless after all."
This evidence that another human being had been in the tunnel gave the boys new courage.
"We'd better go quietly. Chances are that the auto thieves are somewhere around."
A few steps farther, and Frank spied a light in the distance. At first he thought it was only a reflection from his own flashlight, but when he switched it out, the light still glowed steadily through the darkness ahead.
They moved cautiously. Frank did not turn on the flashlight again. He was afraid it might be seen. Step by step, they moved forward, and the glow of the mysterious light became brighter. It was soon so strong that it even cast a certain amount of illumination into the tunnel and the boys saw that the passage was almost at an end.
Then they heard a voice.
They could not distinguish the words, but they could hear some one talking in a quick, rasping tone. Then another voice interrupted.
Frank laid a warning hand on his brother's sleeve.
"Quiet does it," he warned.
They crept forward.