NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
There was once an undersea post office in the Bahamas.
241
In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
707
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
Water is actually naturally blue.
48
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22