Island of the Hungry Ghosts

Island of the Hungry Ghosts is a movie starring Arthur Floret and Poh Lin Lee. While the yearly crab migration takes place and locals perform rituals for ghosts, a therapist works in Christmas Island's asylum seeker detention center.
Christmas Island, Australia is home to one of the largest land migrations on earth—that of forty million crabs journeying from jungle to sea. But the jungle holds another secret: a high-security facility that indefinitely detains individuals seeking asylum.