Edna said nothing, but stood gazing at the wonderful scene--the dark, mysterious waters before her, the arched cavern above her, and the picture of the bright sky and the tops of the distant mountains, framed by the sides of the great opening which stretched itself upward like a cathedral window on the other side of the lake.
"It frightens me," said Mrs.Cliff.

"To be sure, this water was our salvation, for we should have been dead by this time, pirates or no pirates, if we had not found it.

But it is terrifying, for all that.

We do not know how far it stretches out into the blackness, and we do not know how far down it goes.

It may be thousands of feet deep, for all we know.