"I see it now!" answered Tommy.
Sandy saw it, too, in a moment. It seemed at first to be floating in the air at the very top of the gangway. It moved from side to side, and finally dropped down nearer to the floor. There seemed to be no one near it or under it. Its small circle of illumination showed only the empty air.
"What do you make of it?" asked Tommy.
"Is this Tunnel Six?" asked his chum.
"I don't know! If it is, we've seen the light the caretaker referred to. We'll have a great story to tell in the morning!"
The boys stood in the darkness of the gangway watching the light for what seemed to them to be a long time. Now the light advanced toward them, now it receded. Now it lifted to the roof of the gangway, now it dropped almost to the floor.
At intervals, the noises behind the cribbing to which Tommy had referred were repeated, and the boys at last moved over so as to stand with their ears almost against the wooden walls.
"There is some one behind the cribbing, all right!" Tommy declared.
"I hear some one breathing."
"Aw, keep still!" whispered Sandy. "If there is anyone there, you'll frighten them away! I though I heard some one myself!"
"I'll tell you what I think," Tommy suggested in a moment, "and that is that either Will and George, or both of them, beat us to this gangway. They are hiding behind there on purpose to give us a scare."