Ice worth $300m found at Sydney depot

Up to $300 million worth of methylamphetamine has been seized after NSW Police intercepted an air cargo shipment from southeast Asia.

Australian Border Force officers found the consignment at a Sydney freight depot in February after a tip-off from the police.

Police Superintendent Martin Fileman told reporters the shipment contained about 400 kilograms of a white crystalline substance that tested positive for methylamphetamine.

"If this was making it's way into a country town it would decimate it," Supt Fileman said on Monday.

Border force acting commander Garry Low described the concealment as "lazy" but said it passed through several ports before arriving in Sydney.

Investigations are continuing.