Different Stories Of Emusha
As per some narratives, Vishnu scooped up earth with is tusks from the bottom of the sea and spread it on a lotus leaf to create the earth. (Brahmanas)
As per Vishnu Purana, demon Hiranyaksha dragged the earth goddess Bhudevi under the sea. Vishnu emerged from Brahma’s nostril in the form of a boar, plunged into the sea, gored the demon to death, placed Bhudevi on his snout and raised her to the surface.
The union of Emusha and Bhudevi under the sea resulted in the birth of Naraka who was later annihilated by Krishna and Satyabhama. (Srimad Bhagavad Purana)
As per Shiva Purana, the Emusha form of Vishnu showed no interest in returning to Vaikuntha. Shiva then took the form of a bull, flayed Emusha alive with his horns and liberated it from the delusion of earthly life.