Oceans: The Atlantic Ocean

Friday, December 25 at 9 p.m. ET

In one of the most dangerous dives of the series, the team enters a black hole to discover what our oceans would have looked like 350 billion years ago, when they were little more than toxic soup. The expedition later investigates the oldest living evidence of life on Earth, dives into shark-infested waters to test shark-repellent and uncovers how the Atlantic has been invaded by a poisonous alien fish.

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