Kate Winslet achieved a remarkable feat by holding her breath underwater for seven minutes and 15 seconds during the filming of "Avatar: The Way of Water." The achievement is notable, especially since even professional freedivers train for years to reach similar durations. Winslet's success is attributed to training and utilizing specific techniques, including pre-breathing with 100% oxygen and possible hyperventilation. These methods increase the body’s oxygen stores and help delay the urge to breathe, allowing for extended breath hold times.

The feat puts Winslet in an elite category, with the only comparable records achieved by professional divers. These divers often employ oxygen-assisted techniques to push the boundaries of human capacity, such as Budimir Šobat's 24-minute world record. The record for non-oxygen-assisted holds stands at much shorter times. Winslet's accomplishment on a movie set exemplifies the convergence of meticulous preparation, scientific understanding of human physiology, and the demands of cinematic authenticity.