Soon the tops of trees were seen far below. At least they looked like trees, with branches, foliage and all, but Frank said:
“It is a queer coral formation. A very common mistake is made by divers who consider them petrified.”
Von Bulow was deeply interested in the submarine forest.
But soon a new scene spread before their view.
It was such a scene as none of them had ever seen before.
One and all gave expression to startled cries of interest and wonderment, and Frank slackened speed.
CHAPTER IX.
THE SUNKEN CITY.
“A city under the sea!” cried Prof. Von Bulow. “Wonderful thing!”
All gazed upon what certainly seemed to be a mighty city, built upon a plain.
Mighty buildings lined wide streets, which traversed the plain in every direction.