"Poorna" is based on a true story of Malavath Poorna, a tribal girl from Telangana who created history on May 25, 2014, by becoming the youngest girl in the world to scale the Mount Everest.
She was just 13-year-old when she pitched the Indian flag at 6 AM.
Rahul, who has produced, directed and also features in the film, says he was initially only approached to play the role of Poorna's mentor.
"I think that's embarrassing. As it is when you say, 'this is produced, directed and acted by me,' people joke,'Have you done the costume as well ?' It is embarrassing. I feel bad about it," he told reporters on the trailer launch of "Poorna"
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The film marks Rahul's return to direction after the 2001 "Everybody Says I am Fine!" and the actor says it was difficult to juggle between performing and directing on sets.
Though it has been more than a decade since his directorial, Rahul says rather than direction it was the technical aspect of the film for which he was more worried about.
"It wasn't that direction is new for me but the world of digital space is totally new for me. It was good but I was scared too. There's a lot of VFX in the film.
"The film starts off like Malgudi Days and ends like the Hollywood film Everest. To do that, especially the second half, that fear was there definitely. But it happened," Rahul added.
The film is scheduled to release on March 31.
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