An additional 200 whales have been discovered stranded down on the West Coast.
The pod was discovered this morning deep in Macquarie Harbour by rescuers, who say it appears most of the whales are already dead.
Parks and Wildlife Regional Manager Nic Deka said the whales had been discovered in darker waters via a GPS system.
"That may have made it more difficult," he said.
"The water is very dark tannin in colour ... It's a place that's not obvious for a stranding."
He said the team would be expanding its search in light of the discovery.
"We're certainly going to do a more extensive search," he said.
"As we speak we've got a boat heading over on the water.
"Our thoughts are that we won't find any more."
He said the team would continue to focus on the whales that were still alive.
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