dudustan: when n reefs begin n o ccollapse, thehe people thatat y on thosose reefs get in their boats and they paddle off someplace else. they don't have anyplace else to turn except to other places that have coral reefs. alling: sutama is s a former cyanide fisherman, so he understands the pressure that local fishermen are under. it's hard to make money on fish anymore. there's just not that many, and so resorting to cyaninide fishing is a q quick catch, so he understands that. and he also understands how bad that is for the reef, how devastating that is for the fish populations, so he's the perfect person to go and speak to the fishermen and explain to them why they've got to let up. [sutama speaking native language] alllling: as the fish populatios decline, there's less and less big fish. so if you take all the big ones, you've got no more babies coming in. and then, if you start taking the little ones, even the little few babies you have that have made these little fish, they can't even get to make more fish. dustan: corals make the frame of the reef. the other animals live in and

of the toxic components within that dust, given the coal mining, and the blasting, and thatat sort ofof thing. now, you can feel this w wind. this wind is blowing across us right into the game reserve. so, they mine here, this southeastern wind will carry the dust, and the fallout will be in the park, in the wilderness area. >> if it goes ahead, the coal mine wiwill be right against the boundary fence of the park. this community of 1,200 peoplee will be forcrcibly relocat off the land. another coal mine opened in 2007, 10 kilometers away from the villllage, and d people herere alreready fall sick from breathing the toxic dust. >> [speaking afrikaans] >> this is an aerial view of the older mine, which nduna's nephew says is already causing their cattle to die. >> we are also feeling the consequences of them allowing that mine there. we'veve already witnessed some of our cows dying. the past year, i'm talking about from june last year till now, i myself have lost about 18 of them. >> to have so many fall ill and die means that the rhinos and other animals next door in the park w who drink the same wate

y an industrial scale. peters: that's a highly organized, highly efficient orgaganized crime network thatas putting thatat typeof operation together. narrator: between 2009 and 2014, organized criminal networks moved an estimated 170 tons of ivory, the yield from a quarter of a million dead elephants. vira: we estimate that there probably are less than, you know, 25 of ththese networks operating globally that accounut for a very lararge proportion of t the trade. narrator: one of them is the xaysavang network, reported to be one of the largest transnational criminal networks to traffic wildlife. the u.s. department of state offered a $1 million reward, the first bounty ever placed by the agency for information leading to the dismantling of the network. vira: xaysavang is based out of laos and is widely suspected that they have the complicity of s senior otian govevernment officials, whichch is part of te reason why, despite a bounty, despite all the attention, despite all l the investigative reporting, not very much is being done to reallyly disrupt that network.. narrator: central and eastern africa are the c

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