The young diver understood, and in haste the pair withdrew from the circle of combat.
Then they literally ran for the diving bell.
It was a fearful strain upon each, for their diving suits weighed seventy-five pounds apiece.
They were still a score of feet from the bell when some of the demons saw them running and started in pursuit.
"We are lost now!" thought Dave, but continued to run, and urged his parent before him.
At last both gained the diving bell, all but exhausted.
Entering, they snapped the door shut and sent the signal up.
Soon the bell was rising. To assist, they began to pump the water out of the bell.
The demons swarmed all around the bell, but did not dare to touch the glass sides or the crab-like claws.
Soon the bell passed from the zone of submarine light and then the demons dropped back, for they could not breathe in the upper portions of the ocean.