The Alien World of Deep Sea Mollusks and Other Oceanic Wonders

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'What percentage of knowledge do we know about the ocean?

According to the National Ocean Service, it's a shockingly small percentage. Just 5 percent of Earth's oceans have been explored and charted – especially the ocean below the surface.'

(Source)

How Much of the Ocean and Space Have We Explored? | Worldwide Boat

 

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Feel free to add any aquatic wonders both creepy or delightful.