Ramayana
ततोपधार्य मायानां शतमेकं समाप्तवान् । सलिलेन्द्रपुरान्वेषी भ्रमति स्म रसातलम् ॥ 7-23-16 ॥
Then, having mastered a full hundred of their magic arts, seeking the city of the lord of the waters, he roamed about the nether region of Rasatala.
english translation