How Do They Do It? Season 12 Episode 20 Power Tunnel, Pizza Ovens, Playhouses ( Air Date 2015-10-01 ) Genre Documentary category. Overview "How do they build tunnels to prevent blackouts in one of the world's biggest cities? How do they turn millions of hectares of pine forest into perfect pieces of timber?".
How Do They Do It? Season 12 Episode 20 Power Tunnel, Pizza Ovens, Playhouses
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