Jetsun Kunga Chokdrub studied the teachings of different Tibetan Buddhism traditions, and promoted the definitive meaning of other-emptiness and the Great Perfection (Dzogchen) teachings. He retreated for 12 years to practise the Six Yogas of Kalachakra intensively, and realised the Khechara and Rasayana when he attained stability of the lungs (oral transmissions). He also achieved mastery of life time. Records state that there was a time that he left his corporeal form to travel to the pure realm of Shambala, and returned only when he was 131 years old. Then, his fundamental subtle mind dissolved with the sphere of light (illusory body), and what remained was the non-differentiation in Kalachakra’s heart. One of his more renown student was Kunga Drolchok.