The attack took place at the Sacred Heart of Jesus Cathedral in Makassar, the capital of South Sulawesi province.
East Java Gov. Khofifah Indar Parawansa said authorities are investigating the cause of death while the carcasses will be buried around the coast.
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.