The Mergui Archipelago had been closed to foreigners for nearly 50 years. Now, scientists are exploring the marine environment there. They've found that over the last few years, a lot of damage has been done.
In this episode: Cleaning up Argentina's dirtiest river, environmental concerns over salmon farming in Scotland, dynamite fishing threatens Tanzania's coral reefs - and the volunteers who help injured turtles in Greece.
Holiday idyll or crime scene? In Tanzania, dynamite fishers toss up to 50 bombs a day into the coral reefs - using a technique that, in theory, is outlawed. A task force is hoping to put an end to the dangerous practice.
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