More than six years after Operation Ark targeted a $50m designer drug ring, the Weekend Herald can reveal the story of London Underground. Among the characters were a Breaking Bad-style scientist, a banker and a business partner in Thailand. Jared Savage explains how party pills started in New Zealand.

Party pills were born at a K Rd bar called Sinners.

Chris Chase and Lee Vincent, two young men on a night out, had a chance 3am encounter at the Auckland nightclub in 2001.

Both were bodybuilders; they bonded over where to score steroids.

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Within minutes of meeting, the pair were

Stripping and science

From Cambodian jungle, to Chinese laboratory

Operation Ark

A legal loophole

What's in a guilty mind?

Six years of secrecy

The London Underground saga

Sentences for Operation Ark and Greenstone