[1] Owen Sheers wrote the script of the screenplay using the words of survivors of the disaster whom he interviewed over a period.
[2] Sheers described The Green Hollow as “a film poem in the voice of Aberfan, both then and now”.
[3] Actors who participated in the film, reading in the authentic voices of those who witnessed the disaster, included Michael Sheen, Jonathan Pryce, Siân Phillips, Eve Myles, Robert Pugh and Iwan Rheon, and the film was directed by Pip Broughton.
Sheers said that he had at first been doubtful about the project because he did not want to exploit the grief of the local community.
He later concluded that "I realized that this small community had become defined by the disaster and I wanted to show what the place was like before that.