Luffy infiltrates the underwater prison Impel Down to rescue his brother Ace. Facing deadly jailers and monstrous inmates, he pushes forward despite overwhelming odds. Magellan, the prison’s fearsome warden, proves nearly unbeatable. Alliances form with former enemies in desperate circumstances. The tension never lets up as danger lurks at every level. A fast-paced, high-stakes rescue mission filled with relentless action.