'The Crown' cast sending additional voice work from their phones during coronavirus shutdown

Olivia Colman as Queen Elizabeth II in the third season of 'The Crown'. (Credit: Des Willie/Netflix)

The cast of The Crown is still working to complete the fourth season during the coronavirus shutdown, sending additional voice work to the post-production team via their phones.

According to a report in the Daily Mail, 99% of filming had already been completed on the latest run of the blockbuster Netflix show before production was forced to halt due to the pandemic.

However, there’s still work to be done and the cast is helping out in the only way they can.

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Post-production staff are scouring unused footage to make up for the fact pick-up shots are impossible and actors are sending in voice work from their smartphones.

Sound engineers are then splicing the newly recorded audio into the show.

Tobias Menzies, Olivia Colman and Helena Bonham Carter pose for photographers upon arrival at the world premiere of 'The Crown' season 3. (Photo by Joel C Ryan/Invision/AP)

Olivia Colman will return to the role of Queen Elizabeth II for the fourth season, having taken over from Claire Foy after season two.

Colman won a Golden Globe for her work in the third season.

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Imelda Staunton is set to step into the role of Queen Elizabeth II for the fifth and final season, with the show culminating before it enters the world of modern events.

Olivia Colman in 'The Crown'. (Credit: Des Willie/Netflix)

The current cast also includes Helena Bonham Carter as Princess Margaret, Tobias Menzies as Prince Philip and Josh O’Connor as Prince Charles.

The fourth season will introduce Emma Corrin as Princess Diana and Gillian Anderson as Margaret Thatcher.

Read more: Colman discusses drastic weight changes for royal roles

Created by screenwriter Peter Morgan, The Crown is one of Netflix’s most popular — and indeed expensive — TV series.

There is currently no release date for season four of The Crown, but it is expected to land on Netflix in November or December 2020.