At least 268 divers were deployed in the search on Thursday.
Poaching is one of the biggest threats facing the species.
The volcano in North Sumatra province was shooting smoke and ash more than 1,000 meters (3,280 feet) into the air and hot ash clouds travelled one kilometre (0.6 mile) south east, Indonesia’s Volcanology and Geological Hazard Mitigation Centre said.
Rumbling Mount Sinabung on Indonesia’s Sumatra island erupted Monday, sending a column of volcanic materials as high as 5,000 metres into the sky.
Indonesia's Mount Merapi volcano erupted spewing a plume of ash above Java on Tuesday morning, March 3.
Indonesia and neighbouring countries in Southeast Asia are regularly hit by smoky haze from slash-and-burn clearances of forests for timber and palm oil plantations.
Panama-flagged container ship Soul of Luck collided into a gantry crane in Semarang, Indonesia on Sunday 14 July, causing the crane to collapse.
At least 10,300 people were affected by the floods that hit Samarinda, Indonesia, on Sunday.
Mount Sinabung in Indonesia erupted on Sunday and threw a seven-kilometre ash column at 4:28 local time. The volcano observatory for aviation has placed Sinabung on red alert, which usually means that the eruption is imminent.
The beauty industry giant, in charge of Clinique and MAC cosmetics, debuts a new scheme to make palm oil production more sustainable in Indonesia.