Transcriber: Andrea McDonough Reviewer: Bedirhan Cinar

Coral reefs are some of the most spectacular ecosystems

on the planet.

They're also some of the most vulnerable.

But how can we protect the reefs

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More than two kilometers below the surface of northern Ontario,

suspended in 345,000 liters of ultra-pure water,

there’s a perfect sphere.

It contains 3600 kilograms of liquid argon,

cooled to -180

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