SB 10.45.41
aste tenahrto nunam
tac chrutva satvaram prabhuh
jalam avisya tam hatva
napasyad udare ’rbhakam
Translation:
“Indeed,” the ocean said, “that demon has taken him away.” Hearing this, Lord Krsna entered the ocean, found Pañcajana and killed him. But the Lord did not find the boy within the demon’s belly.