Mahabharata 8.27.25
समुद्रतरणं दोर्भ्यां कण्ठे बद्ध्वा यथा शिलाम्गिर्यग्राद्वा निपतनं तादृक्तव चिकीर्षितम्
samudrataraṇaṃ dorbhyāṃ kaṇṭhe baddhvā yathā śilāmgiryagrādvā nipatanaṃ tādṛktava cikīrṣitam
Our plain-language meaning of this verse is waiting for scholar review.