SAN SEBASTIÁN — Brazilian-Chilean production “Mariana x BHP,” Basque drag story “Altxaliliak” and Peruvian-U.S. co-production “La increíble historia de una película que no hemos visto” took the top prizes at the 21st Lau Haizetara Documentary Co-Production Forum, part of the San Sebastián Festival.

Renan Flumian’s “Mariana x BHP,” produced by Droma Productions and Quijote Films, won the Music Library & SFX Award for its legal-thriller take on the aftermath of Brazil’s Mariana dam collapse. Maia Iribarne Olhagarai’s “Altxaliliak,” from Doxa Producciones and Gastibeltza Filmak, scored the Euroregional Documentary Award with its portrait of four queer Basque performers reclaiming identity through drag. Meanwhile, Claudia Chávez Levano and Christine Mladic Janney’s “La increíble historia d

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