Mbh 3.107.2a

“And those same sons of Sagara, accepted this command of their father, and once more began to search through the entire world. Now these heroes saw a rift on the surface of the earth. And having reached this pit, the sons of Sagara began to excavate it. And with spades and pickaxes they went on digging the sea, making the utmost efforts. And that same abode of Varuna (namely the ocean), being thus, excavated by the united sons of Sagara and rent and cut on all sides round, was placed in a condition of the utmost distress. And the demons and snakes and Rakshasas and various (other) animated beings began to utter distressful cries, while being killed by Sagara’s sons. And hundreds and thousands of animated beings were beheld with severed heads and separated trunks and with their skins and bones and joints rent asunder and broken. Thus they went on digging the ocean, which was the abode of Varuna and an exceedingly long space of time expired in this work, but still the horse was not found. Then, O lord of earth! towards the north-eastern region of the sea, the incensed sons of Sagara dug down as far as the lower world, and there they beheld the horse, roaming about on the surface of the ground. And they saw the magnanimous Kapila, who looked like a perfect mass of splendour. And having beheld him shining with his brightness, just as the fire shineth with its flames, they, O king! seeing the horse, were flushed with delight. And they being incensed, sent forward by their fate, paid no heed to the presence of the magnanimous Kapila, and ran forward with a view to seizing the horse. Then, O great king! Kapila, the most righteous of saints,--he whom the great sages name as Kapila Vasudeva--assumed a fiery look, and the mighty saint shot flames towards them, and thereby burnt down the dull-headed sons of Sagara. And Narada, whose practice of austerities was very great, when he beheld them reduced to ashes, came to Sagara’s side, and gave the information to him.