"How high?"
"A hundred and eighteen in the shade!"
Dross could not believe it and examined the glass for himself.
"Right you are, captain. No wonder I was getting ready to keel over down there from the heat."
"We will sink to the bottom of the sea," answered Oscar. "It must be cooler there than up here."
A fresh supply of air was taken on board and soon the submarine craft was slowly descending.
At this point the bed of the Caribbean Sea lay a quarter of a mile below the surface and was broken up by a series of ridges and several hilltops, which looked as if in years gone by they might have been islands.
"It is cooler here," said Andy, while they were resting on the bottom. And then, glancing out of the window, he continued: "What beautiful seaweeds and trees! Oscar, do you suppose this part of the ocean was ever an island?"
"More than likely, Andy."
"What caused it to sink—an earthquake?"