a hellish churning of white-water

"But in the foamy confusion of their mixed and struggling hosts, the marksmen could not always hit their mark; and this brought about new revelations of the incredible ferocity of the foe. They viciously snapped, not only at each other's disembowelments, but like flexible bows, bent round, and bit their own; till those entrails seemed swallowed over and over again by the same mouth, to be oppositely voided by the gaping wound."

"The Shark Massacre"
Moby-Dick