Underground Rivers - University of New Mexico

In The Castle of Adventure (1946), Jack
enters the Scottish castle via the chilly and
claustrophobic underground stream, but the
other children fail to notice that he's wet.
A mystery within a mystery, we can call it.
Chapter 23 -- Girls, Too!
The African waterfall discovery would be echoed in The
Valley of Adventure (1947) set in Austria. Two entrances
are discovered into the mountain: a rock that pivots open
and the cave from where the river escapes as a waterfall.
Fortunately Jack, Philip, Dinah and Lucy-Ann have a
treasure map.
In The Secret of Killimooin (1943),
Peggy, Nora, Jack, Mike, Paul, Ranni
and Pilescu see the Secret Forest from
their blue and silver plane. There are
no passes through the mountains and
yet Jack sees smoke rising from the
trees.
The only way in is via an underground
river, which involves evading robbers,
and that's as much of the plot as we'll
recount.
Jack spoke at last. Ranni, where do you suppose this river goes to? It must go somewhere. If
it was penned up in this valley, it would make a simply enormous lake, and it doesn't do that, or
we should have seen it from the air, when we flew over.
Ranni sat and thought. It must go somewhere, of course, he said. Maybe it finds its way
underground, as it did in the mountain. You think perhaps it would be a good idea to follow the
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