Since Monday, hundreds of long-finned pilot whales have been found beached on Tasmania's west coast.
Rescuers had managed to save 50 by late on Wednesday, and they were trying to help the remaining estimated 30 whales.
Tasmanian government officials said the rescue effort would continue "as long as there are live animals".
"While they're still alive and in water, there's still hope for them - but as time goes on they do become more fatigued," said Nic Deka, regional manager for Tasmania's Parks and Wildlife Service.
