The woman also explained how the big cave was used for religious services by her people, who worshiped the northern lights, or magnetic fire that never burned, and she told how they sacrificed to it at times.
"Well, I hope they don't sacrifice any of us," said the professor. "I was as near death as I ever care to go. I wonder what has become of my airship. If we—"
"What's that?" cried Jack, starting up.
"Listen!" came from another.
Far off in the cave sounded a strange, wild, weird chant. Then came the tramp of many feet. A little later a great concourse of people came rushing into the cave, led by a score of the white-robed men.
"They're coming back after us!" cried Andy. "Here, take a revolver,
Professor, and defend yourself!"
CHAPTER XXV
ADRIFT ON THE ICE
"No shoot! Me save!" exclaimed Dirola, springing in front of Andy. "You trust me!"
On came the crowd, plainly visible because of the magnetic fire. It came to a halt a short distance in front of the adventurers, while from the ranks of the white-robed ones stepped forth a native. He spoke rapidly to Dirola, who answered him in fierce tones.