A trailer for James Cameron's Avatar sequel, The Way Of Water, has been released.

Viewers see the return of Na'vi people on the planet Pandora in the long-awaited sequel almost 13 years after the original epic was released.

The beginning of the trailer reintroduces Jake and Neytiri Sully and their children, as the story picks up more than a decade after the events of the first film.

Fans are given a glimpse at below the waves of the ocean and shown a number of fantastic creatures including colourful jellyfish, whales and large winged fish.

Jake is seen teaching his daughter to hunt using a bow, as she tells him: 'Dad, you know I think I am crazy but I feel her. I hear her heartbeat. She is so close.'

He asks: 'So what does her heartbeat sound like?' before she replies, 'Mighty'.

The Na'vi people native to Pandora are also seen going back into battle with what appear to be humans using advanced technology and weaponized 'mech suits'.  

The sequel highlights the trouble that follows them, the lengths they go to keep each other safe, the battles they fight to stay alive, and the tragedies they endure.

The cast for the much-anticipated film includes Sam Worthington, who plays Jake, and Zoe Saldana, who takes on the role of Neytiri.