In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
707
There was once an undersea post office in the Bahamas.
241
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
Water is actually naturally blue.
48
The Caspian Sea is also classed as the world's largest lake.
52
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8