During the samudra manthan, the Mandara mountain started sinking. To raise it, Vishnu incarnated as a tortoise. This tortoise (kurma) is called Aadikurma (see Indradyumna, Avatar) as per Mahabharata Adiparva Chapter 18 verse 12.
During the samudra manthan, the Mandara mountain started sinking. To raise it, Vishnu incarnated as a tortoise. This tortoise (kurma) is called Aadikurma (see Indradyumna, Avatar) as per Mahabharata Adiparva Chapter 18 verse 12.