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Underwater welders have one of the world's riskiest jobs. We followed welders in Indonesia who dive with minimal protection in polluted waters to build piers for petrochemical plants that are booming across the country.
Indonesia ranks as one of the world's biggest contributors to ocean plastics, and a lot of it comes from rivers.
The local nonprofit Sungai Watch saves about 3 metric tons of trash from entering the ocean every day with simple barriers and manual labor.
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