The ocean covers 70 percent of the planet's surface, and we've only explored around 20% of it so far. Back in March 2019, scientists stumbled upon one of the most baffling phenomena ever: a small lake that was upside-down! If you ever check out the ocean surface during sunset and sunrise, you might get lucky enough to see green flashes. In the depths of the Pacific Ocean, there's a mysterious singing whale, which scientists have yet to fully understand. Let's travel into the depths together to try to uncover some of the world ocean's secrets.

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