Dugnong Dugon
They are found from East Africa to Australia decently near the coast
They mainly live in the epipelagic zone, and sometimes the mesopelagic zone
In the Malay language duyong means lady of the sea or mermaid. This is interesting, as a dugong is actually quite ugly.
They can be 2.4 to 3 metres
They can stay underwater 6 minutes before surfacing