Mahabharata 1.117.33

गन्धर्वनगराकारं तत्रैवान्तर्हितं पुनःऋषिसिद्धगणं दृष्ट्वा विस्मयं ते परं ययुः

gandharvanagarākāraṃ tatraivāntarhitaṃ punaḥṛṣisiddhagaṇaṃ dṛṣṭvā vismayaṃ te paraṃ yayuḥ

Our plain-language meaning of this verse is waiting for scholar review.