The belief that **Avatar 3 is filmed entirely underwater** is a popular fan theory, but the reality is more nuanced. While underwater scenes and underwater performance capture technology play a significant role in the production of Avatar sequels, including Avatar 3 (titled *Avatar: Fire and Ash*), the entire film is not shot underwater. Instead, the filmmakers have developed groundbreaking technology to capture underwater performances, which is a major innovation in filmmaking, but the movie combines underwater scenes with traditional live-action and motion capture filming on land and in water tanks[1][2].
James Cameron and his team began principal photography for *Avatar: The Way of Water* (Avatar 2) and *Avatar: Fire and Ash* (Avatar 3) simultaneously in 2017. They used a combination of live-action filming, performance capture, and underwater filming techniques. The underwater scenes required the cast to learn free diving and perform in a massive 680,000-gallon water tank designed specifically for this purpose. This tank allowed the actors to perform underwater while their movements and facial expressions were captured using advanced underwater motion capture technology, a first for major Hollywood productions[2][3].
The filming locations were diverse, including places like Manhattan Beach, California, New Zealand, the Bahamas, Hawaii, and others. This variety of locations indicates that the production was not limited to underwater filming but included extensive live-action and motion capture work on land and in controlled water environments[1][2].
The documentary *Fire and Water: Making the Avatar Films*, set to premiere on Disney+ in November 2025, offers an in-depth look at the making of these films. It highlights the technical challenges and innovations involved in adapting performance capture technology for underwater use. The documentary features interviews with James Cameron, cast members, and key production figures, providing insight into how the underwater scenes were created and integrated into the films[2][3][4].
In summary, while underwater filming and underwater performance capture are revolutionary aspects of Avatar 3’s production, the film is not shot entirely underwater. Instead, it is a blend of underwater scenes captured with new technology, traditional live-action filming, and motion capture work done in various locations and specially designed water tanks. This approach allows the filmmakers to create the immersive underwater world of Pandora while maintaining the flexibility and control needed for a complex blockbuster production[1][2][3].
