More than 700kg of drugs were mixed with "putrid waste" yesterday before being cooked and disposed of by Customs.
The truckload of drugs destroyed included methamphetamine and its precursors, cocaine, GBL, ecstasy, cannabis, and synthetic cannabinoids such as Kronic and K2.
They were estimated to be worth tens of millions of dollars.
Customs' spokeswoman Nicky Elliott said the drugs were first shredded before being mixed with "putrid waste" - "a nasty, sludgy mix of all sorts of things like hospital waste".
Rather than being a symbolic act, this was to make the drugs irretrievable, she said.