"I wonder what's down there?" asked Mark.
"It isn't a good thing to think about," responded Jack. "I
always was afraid of whirlpools."
The boat was now beginning to go around faster. The occupants
were getting dizzy with the motion. They could hear a distant
roar, and knew that it came from the water falling down some
great depth, into which they seemed fated to be dashed.
"Did you turn on all the power of the boat?" asked Jack after a
period of silence. "Seems to me we didn't come along very fast
in this craft. The one we were in first went at a great rate.
Maybe we don't understand how to make it go at top speed."
"I turned the knobs every way I could think of," replied Mr.
Roumann. "But it would take terrific speed and power to free us
from the suction of the whirlpool."
Jack moved back to the stern, where the box was, containing the
red substance that furnished power to move the boat. He looked
closely at it.
Meanwhile the boat was moving around in ever-narrowing circles,
faster and faster. Jack noticed that twice in each revolution it
went respectively lower and higher on the course, and always at
the same places.
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