Valmiki Ramayana Yuddha Kanda Sarga 76 Shloka 84

ततः then, सुग्रीवः Sugriva, कुम्भम् Kumbha, समुत्क्षिप्य threw into ocean, उदधेः lifted, तलम् bottom, दर्शयन् to show, वेगेन quickly, लवणाम्भसि into the ocean, पातयामास threw him.

Then Sugriva lifted Kumbha and threw him into the ocean quickly, to show him the bottom.