A Sydney airline employee allegedly helped to import $155 million worth of the drug ice into Australia.
Customer service officer Peter Tran was arrested by federal police officers on Sunday after he boarded a Singapore-bound flight at Melbourne Airport.
At the same time, investigators searched homes in the Sydney suburbs of Ingleburn and Cartwright, as well as a factory in Seven Hills.
They allegedly found heroin, MDMA, LSD and magic mushrooms at Tran's Ingleburn house.
The 22-year-old was extradited to Sydney on Monday and charged with importing a commercial quantity of illicit drugs and supplying prohibited drugs, NSW Police said in a statement on Tuesday.
Border force officers in late July examined a container after it arrived in Sydney from the United States. Inside were two large industrial machines.
Investigators say a 15-tonne injection moulding machine - used to manufacture plastic products - had seven plastic garbage bags concealed inside two internal voids.
Within the garbage bags were 200 clip seal bags containing 207 kilograms of methylamphetamine.
Acting Assistant Commissioner Stuart Smith says the ice was "in a very pure form".
Detectives say Tran used a false name to "quickly" fly on a domestic flight to Melbourne before attempting to leave the country.
It's alleged he then used his real passport to board the Singapore-bound flight which alerted authorities.
"When he was stopped, he only had in his possession three phones and a quantity of cash - there was no baggage detected travelling with him," Mr Smith told reporters on Tuesday.
He described Tran as a "professional facilitator" and said his relationship with any drug syndicate was being investigated.
"We believe he didn't act alone," Mr Smith said.
"We can (also) confirm he does work for an airline and he does have access to our airport."
Tran's matter was mentioned briefly in Central Local Court on Tuesday. He didn't apply for bail and it was formally refused.
He's next due back in court on October 2.