Tenzing Norgay's son has called the Everest industry a "circus" ahead of the release of a new documentary about worker's rights on one of the world's most famous mountains.
Australian film-maker Jennifer Peedom's documentary Sherpa explores the working conditions of sherpas on Mt Everest, who escort tourists up and down the mountain at high risk to their own safety and for very little pay.
Norbu Tenzing, son of Tenzing Norgay, the sherpa who along with Sir Edmund Hilary was the first to reach the summit of Mt Everest in 1953, works in San Francisco as vice-president of the American Himalayan Foundation.
He is a champion of Ms Peedom's documentary and features in it, the Guardian has reported.
Mr Tenzing describes Sherpa as "a big, big gift for the mountaineering workers and sherpas. This is a subject that has always played in our minds and hasn't been talked about much. This film has given that issue a voice."