After this action was performed, one of its participants took a large  jewel and placed it on its chest.
After this action was performed, one of its participants took a large  jewel and placed it on its chest. This activity resulted in a giant bow  being found, as well as the planting of a giant tree that reached up to the  heavens. Although their was initial bickering about who would hold a  tail and who would hold a head, it was a group effort between the gods  and the demons, both of whom held onto a large (*) serpent. It was  performed to extract some delicious nectar after a garland was stomped on by  an elephant. It culminated with the consumption of a poison that turned a  god's throat blue. For 10 points, name this event from Hindu mythology  involving water and a gyre like motion.
After this action was performed, one of its participants took a large  jewel and placed it on its chest.
Churning of the Ocean or Samudra manthan