Watch Series: Outback Opal Hunters Released in (2018) - Season 4 produced by AU, Au, The TV Series categorized in Drama, Adventure, Documentary, History, Reality-TV, and content rating TV-PG with duration 45 min broadcasted as these networks Discovery Channel, Discovery+ (UK), Quest, Streamed at Putlocker & directed by Katherine Barrett. The world's toughest treasure hunters push their bodies and bank accounts to the limit on a quest to strike it rich, hunting the legendary Queen of Gems - Opal. - Season 4