When the motley crew goes to rescue Cap'n Jack Sparrow from Davy Jones Locker in part 3 of the Pirates of the Caribbean film franchise, we find Jack on-board a desert-bound ship populated with his many selves. As the movie unfolds, thousands if not millions of small white crabs appear and assist with Jack's escape.
As far as I can remember, Davy Jones had Aquaman-like powers over sea creatures and owned a magic locker that he collected souls in.
Why did Davy Jones' little white crabs help Jack escape from Davy Jones Locker?