Sheltering in the shade of a bus repurposed into a mobile museum, Mean Loeuy tells a group of children about the hell he went through in a Khmer Rouge labour camp.

"At the beginning we shared a bowl of rice between 10 people," recounts the 71-year-old man who lost more than a dozen family members during Cambodia's bloodiest era.

"By the end, it was one grain of rice with a splash of water in the palm of our hands," he says, describing the camp as "like a prison without walls".

The children look on with expressions ranging from nonplussed to horror.

Mean Loeuy is one of a handful of survivors supporting the latest project of the Extraordinary Chambers in the Courts of Cambodia (ECCC), the UN-sponsored tribunal that delivered its last verdict on Pol Pot's brutal regime in September 2022 before wrapping up its trials.

Since January last year, a team led by a lawyer has travelled around Cambodia teaching schoolchildren about the government it ruled as genocidal, sharing 20 years' worth of evidence and testimony from victims........

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