Mahabharata 5.50.25
अपारमप्लवागाधं समुद्रं शरवेगिनम्भीमसेनमयं दुर्गं तात मन्दास्तितीर्षवः
apāramaplavāgādhaṃ samudraṃ śaraveginambhīmasenamayaṃ durgaṃ tāta mandāstitīrṣavaḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book