James Cameron Calls 'Avatar: The Way of Water' a ‘Love Letter to the Ocean’ (Exclusive)

James Cameron chats with ET's Nischelle Turner in London at the premiere of 'Avatar: The Way of Water.' The director explains how the long-awaited sequel is a tribute to the planet's oceans and why he wanted the movie's story to have an environmental message. Twenty-five years after winning three Oscars for 'Titanic,' Cameron says he hopes the cast's performances are celebrated in awards season. 'Avatar: The Way of Water' flies into theaters Dec. 16.