Special bonus episode. A human source risks his life by becoming a double agent. His existence and his crucial role in helping police know which syndicate members to shadow before the Pong Su's April 2003 arrival has remained a secret until now.

The Last Voyage of the Pong Su is brought to you by the newsrooms of The Age & Sydney Morning Herald. If you’re enjoying this series, leave a review on iTunes and recommend us to a friend.

Reporter - Richard Baker (Get in touch: rbaker@theage.com.au )Executive Producer - Rachael DexterNarrative Consultant - Kate Cole-AdamsConsulting Producer - Siobhan McHughMusic & Composition - Vicki HansenSound design & mixing - John GreenfieldScript translations - Yan ZhuangProduction assistance - Margaret GordonHead of Audio - Tom McKendrick

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