It has one of the largest fishing fleets in the world and much of the catch from Thailand’s fishing boats ends up on Japanese, European and American plates. Yet the industry stands accused of profiting from slave labour. As part of the BBC’s Freedom 2014 season, Becky Palmstrom investigates this tale of modern day slavery. She travels to Thailand and Burma (also known as Myanmar), to find out why and how illegal migrants are being forced onto Thai fishing boats, many of them working for months unpaid. She hears allegations of cruelty and even murder.

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