The Eastern systems of philosophy consider Human body to be a case for the soul. Human body is made up of the Five Elements of Nature, Earth,Water,Fire,Air and Space.Prithvi, Appu,Agni, Vayu and Akasa.These five elements are present in the Universe and it’s objects, both gross and subtle.When these elements are in grosser combination, they appear as physical entities.When their combination is in finer form ,they are in Astral , Sookshma,Abstract Form. Every human body has both Sthoola,Gross and Sookshma Sareera, Subtle Forms. While the grosser form, this physical frame is visible and is nourished by The Essence of Food, subtle body is nourished by our actions and reactions, both in the present and past Lives.

Every body is destined to have a specific number of breaths.Once the limit is reached, Breathing Stops, human body returns to the five elements.Unlike other Religions, in Hinduism, the Subtle Sense organs, seeing,hearing,smelling,eating/speaking ,and touching disintegrate into respective elements.Gross body returns to earth, if buried or turns into Fire when burnt,as ashes.

Both Indian Yogis and Buddhist monks know the process of controlling ,stopping breath.This, in Buddhism, is called Rainbow Body.

‘very advanced people through the century have vanished into what is called rainbow body ( Ja Lu in Tibetan and Indrachāp Kaya in Sanskrit ) where the persons body dissolves into rainbow light and vanishes while teaching their disciples while bells and cymbals and music is heard and insence is smelled . Guru Padmasambhava from Uddiyan in the Indian subcontinent ,in what is called Swat Valley in Pakistan today,who studied in Nalanda and attained enlightenment in Nepal, Kathmanu and was crucial in transmitting Buddhism into Tibet in the 9th century and Prahe Vajra of present day India and Sonam Tsemo of Sakya Tibet went like this .

And gallores of practitioners went in another lower type of rainbow body where their body dissolves gradually within 7–14 days approximately as stipulated by themselves after they stop breathing . Their body is enclosed in a tent by their disciples and 24 hour watch is kept around the tent with chantings and prayers while rainbow lights emit out of the tent and bell and music are heard and incense is smelled and when the tent is opened up in the stipulated time there’s only the clothes and hair and nails etc the rest of the body has vanished . In just one monastery in Kham Tibet ( bordering mainland China)called the Kathog Gumba built around the 11th century , by 1959 when the Tibetans fled from the Chinese , their log book shows 125000 practitioners of that monastery/Gumba in Tibetan alone , had gone in this second type of Rainbow body when they died . Records of other monasteries were destroyed in the cultural revolution. And how many Buddhist practitioners went like these two ways mentioned above in the Indian subcontinent has been lost during the Isalamic invasion of the Indian subcontinent , which completly destroyed Buddhism in the Indian subcontinent . After all by the 8th century 75% of the Indian subcontinent ( not just present day political India ) was Buddhist. And 75% of Asia was Buddhist .

Then there were many Indian, Nepalese and Tibetan Buddhist Mahasiddhas who went to Khechar loka with their bodies which means their body just vanished at the point of death . These are signs in the Vajrayana tradition of Buddhism practiced in Nepal, Tibet, Mongolia ,China and Japan of a very high realisation or level of Enlightenment /Awakening/Bodhi . Since all records were burnt in the Indian subcontinent when people like Bakhtiar Khilji raided Buddhist Monastic complexes like Nalanda , Vikramashila, Somapuri( now in present day Bangladesh where th town of Somapura still exists ) , Odantapuri . Jagaddala etc etc and burnt all the Buddhist books and sutras and Shastras , we have no idea how many lakhs of Buddhists in the Indian sbcontinent went like these . Bhakhtiar himself writes in his diary that he burnt 90,00,000 Buddhist Scriptures in Nalanda alone.https://www.quora.com/Has-there-ever-been-a-Buddhist-monk-disappear-through-enlightenment