Valmiki Ramayana Yuddha Kanda Sarga 67 Shloka 173

तदा then, अतिकायम् huge body, महत्प्रकाशम् highly shining, तत् that रक्षः Rakshasa, तोयनिधौ ocean, पपात fell, परान् other, ग्राहान् alligators, मीनवरान् fish, भुजङ्गमान् serpents, ममर्द crushed, तथा in the same way, भूमिम् into the earth, विवेश entered.

The shining huge body of Rakshasa fell into the ocean crushing the other beings in the ocean like alligators, fishes and serpents that entered into the earth.