The Avatar sequels are among the first major studio movies to resume production since the onset of the coronavirus.
The original Avatar film, which starred Sam Worthington, Zoe Saldana and Sigourney Weaver, is the second highest-grossing film of all time, having raked in £2.25bn ($2.78bn) at the global box office.
In February, Landau revealed that Winslet, who had previously worked with Cameron on 1997’s Titanic, had to hold her breath underwater for seven minutes while shooting.
The four bew sequels are costing 20th Century Fox, which was bought by Disney in 2018, more than $1bn (£808m), making Avatar the first film series to require this much money up front.