"The subterranean river!" was the amazed cry that broke from the lips
of all three.
CHAPTER X.
A NEW MEXICAN STYX.
"The subterranean river!"
The words echoed back weirdly from the vault-like chamber into which
they had now penetrated, and at the bottom of which the stream, upon
which the light of the match had glistened, flowed rapidly. Within
this spacious place the noise was not nearly so loud as it had been
when confined in the narrow tunnel, which, in fact, acted much as a
speaking-tube would have done.
"It can't be!" gasped Ralph, unwilling to believe his own eyes.
"But it is," cried Jack, as, all thoughts of their predicament
forgotten in this strange discovery, they made lavish use of their
matches on gaining the edge of the stream. The river was about twenty
feet in width, and they speedily saw that the roaring sound they had
heard during their progress through the tunnel was produced by a
waterfall some distance above, over which the river plunged into a sort
of basin at their feet.
But this was not the most astonishing thing they found in that first
brief but comprehensive inspection.
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