Police intercept 250 miilion pound drug haul

The transcript details a major drug interception in Sydney, where 168 kilos of heroin were found hidden in cargo shipped from Malaysia. Customs officers discovered the drugs using X-ray technology, leading to the arrest of three individuals. The interception is notable due to its size, as recent years have seen smaller drug seizures. The suspects face life imprisonment if convicted.

What method was used to discover the heroin in the shipment?

What are the potential consequences for those arrested if convicted?