समुद्रस्य ocean's, कुक्षौ cavern, एतत् all this, स्कन्धावारनिवेशनम् where troops were stationed, अत्र there, पूर्वम् past, प्रभुः Lord, महादेवः MahaDeva, प्रसादम् bestow grace, अकरोत् basinisland

"Here is a cavern where all these troops were stationed before crossing the ocean. At this place Lord MahaDeva bestowed his grace on me (before construction of the bridge)."