United States authorities said the illicit cargo - with a street value of AUS$1.29 billion, or US$900 million - was hidden in two shipping containers carrying audio equipment bound for Australia.
The drugs were seized at the Los Angeles/Long Beach seaport on January 11. (Australian Federal Police) Police have seized a record amount of drugs bound for Australia.
The drugs were packaged with smaller quantities of cocaine and heroin, and were concealed in metal boxes labeled as loudspeakers.
Another 25 kilograms of cocaine, worth about $9.5 million, and 5kg of heroin valued at $2.6 million, was also uncovered in the shipment of 850 auto audio parts.
If it had made it to Australian streets, it's estimated to be worth approximately $1.29 billion dollars and equates to some 17 million hits.
As a result of the investigation, Australian Federal Police arrested two US citizens and four Australian citizens allegedly involved with the USA -based transnational crime syndicate suspected of conducting the record-making shipment.
It is alleged they were involved with the US-based crime syndicate under investigation over the shipment.
Three fronted court on Friday on charges including attempted drug importation and possession.
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Australian authorities said Friday the joint U.S.
Australian Federal Police Assistant Commissioner Bruce Hill said: 'They have been sending smaller amounts over the years.
"This cartel is among one of the most powerful and violent drug trafficking syndicates in the world".
"This is the biggest ever seizure of methamphetamine. stopped before it had a chance to reach Australian streets", said AFP Asst.
Three raids in Sydney on Thursday led to the arrest of two men aged 25 and 31, and seizure of 2kg of cocaine.
Jason Halls, Victoria manager for the Australian Criminal Intelligence Commission, said the drugs would have had an "immeasurable" impact on the Australian community.
A white van was also searched and towed from the scene.
It was also the largest haul of meth, or ice, intercepted while bound for Australia.