The last Chiejaus took place in Assif, on Navarino Island. There, Masémikensh, a Yagán teacher, directed the young people's lessons, before their almost total extinction.
Father Martín Gusinde, ethnologist, was the only white man invited and as an ushipin initiate he participated in the ceremony.
During the ceremony the Yagán people sang to distract themselves, and to drive away to the Yetahite, enemy and malignant spirit, jealous of the accomplishments of the Chiejaus.
They also struck the walls of the Marma with sticks and branches, to frighten the spirit.
The dance was one of the favoured parts of the ceremony and it took place at the end of the night. Each dance received the name of the animal, which it imitated. " The Yagán people are true artists in the representation of these animals ", says Aureliano Oyarzún, who was present at such a ceremony.