"Look! Look!" gasped Ned.
In silence, which was broken now only by a low and ominous rumble, more menacing than had been the awful fury of the elements, the travelers looked.
Suddenly there was a quicker movement of seemingly one whole section of the mountain. Great rocks and trees, carried down by the appalling force of the landslide were slipping over the trail, obliterating it as though it had never existed.
"There goes the entrance to the cavern!" cried Ned, and as the others looked to where he pointed they saw the hole in the side of the mountain—the mouth of the cave that led to the lost city of Kurzon—completely covered by thousands of tons of earth and stones.
"That's the end of them!" exclaimed Tom, as the rumble of the earthquake died away.
"Of——" Ned stopped, his eyes staring.
"Of Professor Beecher's party. They're entombed alive!"