Jaws - Breaks stone outcrops

In murky green darkness a hundred feet below the surace, the great white banked, stabbed at the pot, and clamped it in his jaws. He began to shake his head, worrying it from where it was wedged. He shook it loose, breaking off outcroppings of stone in a cloud of sand and murk.
The pot was a homemade latticework of heavy wire fencing. It ripped open as he shook it, and he swallowed a section of wire. As the lobsters scooted off, he lunged after them, snatching the three slowest before they could take refuge in holes in the reef.

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Jaws: The Revenge, Part 1, Chapter 3