The iconic scene from Sir David Attenborough's Planet Earth, which changed our understanding of how polar bears adapt to survive, was captured by award-winning underwater cinematographer Adam Ravetch in 2004. The scene shows a lone male polar bear attacking hundreds of walruses, circling them and attempting to penetrate their six-inch blubber to secure a meal. The polar bear was left limping, deafeated, and gravely wounded from the walrus' tusks. The dramatic scene was part of an episode of Planet Earth's landmark natural history documentary series, which also documents the evolution of polar bears' behaviour due to declining sea ice. The documentary reveals that polar bears are being forced into higher-risk hunting strategies due to sea ice loss.