Water is actually naturally blue.
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There was once an undersea post office in the Bahamas.
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The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
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In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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The Caspian Sea is also classed as the world's largest lake.
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NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8