CHAPTER XIII
The Four Men
Profound darkness enveloped the Hardy boys.
The blackness of the icy pool was no blacker than the darkness of the air above.
Frank rose spluttering to the surface, unharmed by his fall, and as he splashed about, his first thought was for his brother.
"Joe!" he shouted. "Joe!"
There was no answer except from the echoes, and the rocks shouted mockingly back at him. "Joe. . . . Joe. . . . Joe. . . ." growing fainter and fainter until they died away to a mere whisper.
Then there was a splashing almost at his side, as his brother rose to the surface of the pool and struck out blindly.
"Are you all right?" called Frank.
"I'm all right!" gasped Joe.
"Keep beside me. We'll try to find the edge of this pool."
Frank swam forward, groping ahead, until
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