Avatar sequels titles revealed?

Nearly a decade after its 2009 release, director James Cameron's Avatar remains the highest grossing film of all time at the worldwide box office with takings of $2.8 billion.

The 3D extravaganza starring Sam Worthington, Sigourney Weaver and Zoe Saldana is set on Pandora, a distant planet inhabited by the Na'vi a race of aliens with blue skin.

For the past few years the four planned follow-ups have simply been referred to as Avatar 2, Avatar 3, Avatar 4 and Avatar 5.

And details about the four sequels have been more elusive than the element Unobtanium!

This week however, BBC News has seen documentation regarding future Avatar plans which makes reference to four specific projects. Avatar: The Way of Water, Avatar: The Seed Bearer, Avatar: The Tulkun Rider and Avatar: The Quest for Eywa.