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When Balabhadrarama entered the lower world (Patala) after death, among the Nagas who welcomed him, there was one called "Ambarisa". (M.B., Mausala Parva, Chapter 4, Verse 16).
While churning the Milk Sea like this, the first object that rose to the surface was Kamadhenu. Both Devas and Asuras were strongly attracted towards Kamadhenu While all were standing spellbound, Varunidevi with her enchanting dreamy eyes next appeared on the surface. Parijatam was the third to appear. Fourth, a group of Apsara women of marvellous beauty floated up. The Moon appeared as the fifth. Siva received the Moon. The venom which came out of the Milk Sea as the sixth item, was absorbed by Nagas. (Page 31, Puranic Encyclopedia - Vettam Maṇi)
There is another story about Amrtam which says that Garuda once went to devaloka and brought Amrtam from there to be given to the Nagas, but Devendra came down and took it back. This story is given in Mahabharata from Chapter 27 onwards. Vinata, a wife of Kasyapa gave birth to Garuda and Kadru and her sister gave birth to the Nagas. Once there was a dispute between Vinata and Kadru. Vinata said that the hairs on the tail of Uccaisravas, Devendra's horse, were white but Kadru asserted that they were black. To settle the dispute they made a bet. The condition was that the loser must become the servant maid of the winner. As instructed by Kadru, some of the Nagas went in advance and hung down from the tail of Uccaissravas, thus giving the false appearance of a tail with black hairs. By this trick Vinata lost the bet and had to become Kadru's servant maid. As a result of it, the task of looking after Kadru's children became Garuda's duty. Kadru told him that if he fetched Amrtam from devaloka and gave it to the Nagas, she was prepared to release him from the bondage. So Garuda flew up to devaloka, fought with the gods and defeated them. He returned with the pot of Amrtam and gave it to the Nagas. The Nagas went to take their bath after placing the pot on darbha grass spread on the floor. Just then Devendra swooped down and carried away the pot of Amrtam to devaloka. When the Nagas returned after their purifying bath, the pot was not to be seen. In their greed they began to lick the darbha grass on which the pot was placed. The sharp edge of the grass cut their tongues into two. This is why the Nagas (snakes) came to have forked tongues. (Page 32, Puranic Encyclopedia - Vettam Maṇi)