it on and led the way. Above them
a continuous roar could now be heard, and they guessed that the airships
were attacking in force, directly over the German camp, and were being
fired at from all sides.

"One bomb must have splattered Fritz's electric plant," observed Joe, as
he and his chums hurried on as best they could in the somewhat dim light
of the little pocket lamp Blake carried.

Hardly had he spoken when there came a tremendous explosion--one that
staggered the boys and seemed to crumple up the tunnel as though it were
made of paper.

They had no time to cry out. They were thrown down and felt rocks and
stones falling about them, while their ears were deafened by the roaring
sound.

Then came silence and darkness--a darkness that weighed heavily on them
all, while Blake, who had been in the lead, tried to move his hand to
flash on the electric light that had gone out or been broken. He could
barely move, and as he felt dirt and rocks all about him there was borne
to his senses the horrible message:

"Buried alive!"

After that thought mercifully came unconsciousness.

CHAPTER XXV

THE END OF LABENSTEIN

How long they lay entombed in the German tunnel the moving picture boys
did not know. They must have been unconscious for some time.

Joe was the first to regain his senses. Telling about it later, he said
he dreamed that he had been taking views in Earthquake Land and that,
somehow or other, a volcano had fallen on his chest. He had difficulty
in breathing, and no wonder, for as he came to his senses he found that
a great rock and a pile of earth were across him.

Slowly at first, fearing to move much because he might bring down more
debris on himself, Joe felt about. He found that his arms and hands were
comparatively free, though partly buried in earth.

"I say!" he called, and his voice sounded strange in that dark and
broken tunnel, "is any one here but me? Blake! Charlie! Are you alive?"

No one answered, and then, feeling his strength coming back, Joe
ventured to move. He found that he could manage to emerge from the pile
of earth and stones that had fallen on him, fortunately none over his
head. When he ventured to stand upright he tried to pierce the darkness
and find out what had become of his chums.

But he could see nothing until he thought of his pocket lamp and, taking
it in his hand, flashed it about him. The light revealed to him the
figures of Blake and Charlie, lying