Quotation from: Out of Time's Abyss

Written by: Edgar Rice Burroughs

"By the river," he replied; "but first I must go back to the
Blue Place of Seven Skulls and get the poor devil I left there.
I'll have to wait until after dark, though, as I cannot pass
through the open stretch of river in the temple gardens by day."

"There is another way," said the girl. "I have never seen
it; but often I have heard them speak of it--a corridor that
runs beside the river from one end of the city to the other.
Through the gardens it is below ground. If we could find an
entrance to it, we could leave here at once. It is not safe here,
for they will search every inch of the temple and the grounds."