Mahabharata 8.32.13

तस्मिन्सैन्ये महावर्ते पातालावर्तसंनिभेनिमग्नं तं रथं मत्वा नेदुः संशप्तका मुदा

tasminsainye mahāvarte pātālāvartasaṃnibhenimagnaṃ taṃ rathaṃ matvā neduḥ saṃśaptakā mudā

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