Zoe Saldana and Sam Worthington talk Avatar: The Way of Water tech

Avatar: The Way of Water stars Zoe Saldana and Sam Worthington knew they were signing up to be 'guinea pigs' again with the sequel, but they relished the technical challenge.

The stars reprise their roles as Na'vi warrior Neytiri and Jake Sully — a human who now lives permanently in the form of his blue-hued avatar.

Avatar: The Way of Water is in cinemas and IMAX from 16 December.