The Silent Heroes

The Silent Heroes is a 2015 open captioned adventure drama that was directed by Mahesh Bhatt, based on a screenplay by Dr. Piyoosh Rautela and Rituraj Bhatt. The film was released on 11 December 2015 at the Dehradun Film Festival, to coincide with World Deaf Day, and has been billed as the "first commercial movie based on deaf children and enacted by real life deaf kids". It follows the adventures of thirteen deaf children and their perilous journey across the mountainous terrains of Uttarakhand.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.