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
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
There was once an undersea post office in the Bahamas.
241
The time interval from first sighting of the iceberg that sank the Titanic to impact was a little over 30 seconds.
105
Sharks, like other fish, have their reproductive organs in their chests.
248
The Titanic is about as long as the Empire State building is tall.
174
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119