How is it that a country as richly endowed with natural resources as Papua New Guinea with multinational mining companies flocking there like bees to a honey pot is actually going backwards when it comes to key social indicators such as wealth and life expectancy?
Well, in looking for answers to that imponderable, Dateline video journalist Amos Roberts travelled hundreds of kilometres into PNG's rugged highlands where the latest mega-project - the biggest in the history of that troubled nation - is under way. Here's Amos.