The marine conservation group Sea Shepherd has released footage of Japanese factory whaling ship Nisshin Maru with a dead minke whale on its deck.
"The Australian government needs to come clean and do the job that they should be doing, defending the whales in the southern ocean whale sanctuary".
However, this is the first slaughtered whale to be discovered since the International Court of Justice (ICJ) ordered Tokyo to end the Antarctic hunt in May 2014 after concluding the animals were not being caught for, what Japan said was, "scientific research".
It's not great timing either; the images were released the day after Japanese PM Shinzo Abe visited Australia on a state visit.
The Australian government was "deeply disappointed" over Japan's whaling activities, Environment Minister Josh Frydenberg said after an anti-whaling group recently released images of a dead minke whale onboard a Japanese whaling ship.
Japanese whalers have been caught carrying out a bloody slaughter in the icy waters off Antarctica.
"They're hit with an explosive harpoon that goes straight into their body, hooks come out and shrapnel is sent through their body, it's a awful bloody death. these whales can take up to 30 or 40 minutes to die", Hansen told the Australian Broadcasting Corporation (ABC).
Captain of the MY Steve Irwin, Wyanda Lublink, says the whalers are aware of their actions.
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"They're [whales] hit with an explosive harpoon that goes straight into their body, hooks come out and shrapnel is sent through their body, it's a bad bloody death... these whales can take up to 30 or 40 minutes to die", managing director of Sea Shepherd Australia Jeff Hansen said.
"They were in the Australian Whale Sanctuary so they know it's illegal". "No more whales will be killed today", said Meyerson.
"Japan has continued whaling, and we're opposed to that".
"A soon as the whaling fleet saw that Sea Shepherd on the scene, they were scrambling to cover up their illegal operations, they were covering up their harpoons", Mr Hansen said.
"I think our view is pretty well known and we would take the same sort of view as Australia on this", said English, who is on his way home from his first trip to Europe as Prime Minister.
Japan's so-called "scientific research" program used to justify the killing of whales has been rejected by the International Court of Justice and the International Whaling Commission's scientific committee.
"Despite the global court ruling that Japan's whaling is illegal, whalers have continued their trade under the guise of "scientific research" - a claim found by the court to be entirely false", he said.