The secret recording, broadcast this evening by Channel 4 News, hears Rupert Murdoch apparently railing at the the way the police behaved in arresting his journalists.
"Still, I mean, it's a disgrace. Here we are, two years later, and the cops are totally incompetent," he is heard saying, adding: "The idea that the cops then started coming after you, kick you out of bed, and your families, at six in the morning, is unbelievable."
He also is heard saying: "But why are the police behaving in this way? It's the biggest inquiry ever, over next to nothing."
Mr Murdoch is heard adding: "And now they're arresting their own, who never even took money... They're going to put all newspapers out of business."
Rupert Murdoch has been heard condemning police who are investigating alleged phone-hacking and illegal payments to officials by his journalists as "totally incompetent" in a secret recording broadcast by Channel 4 News.
The News Corp boss is heard apparently regretting the amount of information his company had handed over to the investigation - describing it as a "mistake" - while also appearing to tell staff who feared losing their jobs if found guilty of any offences to "trust" him.
The recording, obtained by the Exaro investigative website, was said to have been made in March during a meeting with journalists from The Sun at his newspapers' headquarters in Wapping, east London.
A spokesman for News Corp told Channel 4 News: "No other company has done as much to identify what went wrong, compensate the victims, and ensure the same mistakes do not happen again.
"The unprecedented co-operation granted by News Corp was agreed unanimously by senior management and the board, and (News Corp's management and standards committee) the MSC continues to co-operate under the supervision of the courts.
"Rupert Murdoch has shown understandable empathy with the staff and families affected and will assume they are innocent until and unless proven guilty."
Wendi Deng gained popularity for springing to her husband's aid when a protester threw a custard pie at him as he appeared before MPs to answer questions about phone hacking in 2011.
At 44, Ms Deng is 38 years younger than Mr Murdoch, who is 82.
Rupert Murdoch's divorce filing said the "relationship between husband and wife has broken down irretrievably," according to a New York Times report.
It added that a spokeswoman for News Corporation, his media company, confirmed that it was Mr Murdoch who had made the filing.
The spokeswoman added that the divorce would have no impact on the company.
Rupert Murdoch's first marriage to flight attendant Patricia Booker took place in 1956 and lasted 11 years. They had one daughter, Prudence, in 1958.
In 1967, he married the Scottish-born journalist Anna Torv after the pair met at his Sydney-based newspaper The Daily Telegraph.
They had three children together - Elisabeth, Lachlan and James - over the course of more than 30 years of marriage.
Within a month of their divorce in 1999, Murdoch married Chinese-born TV executive Wendi Deng with whom he had two more daughters - Grace and Chloe.
Wendi Deng is perhaps best known in Britain for defending husband Rupert during a physical attack at a parliamentary hearing in 2011.
The Chinese-born businesswoman was seen landing a slap on the face of activist Johnnie Marbles, who had attempted to throw a foam pie at Mr Murdoch.
News Corporation chief executive Rupert Murdoch has filed for divorce from his wife Wendi, the company confirmed.
Murdoch, 82, married Wendi Deng, his third wife, in 1999. The reasons for the filing were not immediately clear.
Media tycoon Rupert Murdoch claimed Britain is "far more successful" because of Baroness Thatcher's "brave leadership".
Mr Murdoch praised the former Prime Minister's role in facing down the trade unions in the 1980s and said the Government made it possible for News International to survive a year of industrial action fighting against a move of operations to Wapping, East London.
The tycoon wrote in The Times (£): "Mrs Thatcher understood that risk was a vital ingredient in a free enterprise society. She understood that such a society had to be led by a government with backbone.
"After the Second World War, in which the country lost a second generation of its finest men, Britain had created a dependency state. It killed off aspiration.
"In 1979 Margaret Thatcher set about its rehabilitation. She put the economy on a sound footing, she ended a culture of crippling strikes, she encouraged entrepreneurs to come here and set up their businesses.
"Thanks to her I have experienced in Britain many of my defining moments as a businessman, a Britain that is far more successful as a result of her brave leadership."
Mr Murdoch tweeted this evening about how Nigel Farage, whose party finished a shock second in the Eastleigh by-election, was "reflecting opinion":
Few days in UK, Italy. Politics both places very fluid, economies going nowhere. New leaders emerging on distant horizon.
Boris Johnson, Michael Gove, few excellent, frustrated ministers. Farage reflecting opinion. Florence mayor Renzi brilliant young Italian.