Desc: On Thin Ice: Directed by Chris Grainger. With Greg Grainger, Stewart Webber, Shaun Bobier, Nick Lunn. With predictions of polar bears being extinct in 50 years, On Thin Ice follows bears as they emerge from their dens and navigate their rapidly changing environment. On Thin Ice shows how the frozen expanses of the Arctic are shrinking at an unprecedented rate, with the very survival of the polar bear literally on thin ice.