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Transcript

00:00This is the heart of the Amazon.

00:11There are water worlds here that are so remote that even today few people have ever seen them.

00:20This barely explored tributary is the Rio Claro.

00:24And here, when conditions are just right, it's possible to witness a rare and remarkable spectacle.

00:32The river is so crystal clear that its bed is bathed in sunlight.

00:38A magical landscape of miniature mountains and valleys.

00:43It's carpeted by pipewort, fanwort and star grasses.

00:58As the sun times in the sky, bubbles of gas appear.

01:13Evidence of photosynthesis.