Mahabharata 12.221.6

कदाचित्प्रातरुत्थाय पिस्पृक्षुः सलिलं शुचिध्रुवद्वारभवां गङ्गां जगामावततार च

kadācitprātarutthāya pispṛkṣuḥ salilaṃ śucidhruvadvārabhavāṃ gaṅgāṃ jagāmāvatatāra ca

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