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
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
It's impossible to sink in the Dead Sea without equipment!
72
The Titanic is about as long as the Empire State building is tall.
174
There was once an undersea post office in the Bahamas.
241