SB 3.17.24
tato nivrttah kridisyan
gambhiram bhima-nisvanam
vijagahe maha-sattvo
vardhim matta iva dvipah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After returning from the heavenly kingdom, the mighty demon, who was like an elephant in wrath, for the sake of sport dived into the deep ocean, which was roaring terribly.