Actress Dia Mirza, who was recently seen in the pandemic movie `Bheed`, has narrated documentary `Big Ocean States`. The documentary focuses on conservation of marine ecosystems and is part of series `Restore: Films From the Frontiers of Hope` by the United Nations Environment Programme`s (UNEP).

The project is an attempt to amplify stories from ten places around the globe where people have made a positive impact on the environmental crisis. The series also has an episode on Ganga, featuring the stories of farmers, wildlife advocates, and government experts who are teaming up to save the holy river.