With both arms about Binney, Glen was straining every nerve of his muscular young body to tear his friend loose from the grasp of the terror that held him. He could not; but a wall of black water four feet high, that came rushing down on them with an angry roar, was mightier even than the quicksand, and, seizing both the boys in its irresistible embrace, it wrenched them loose and overwhelmed them.