The majority of life on earth is aquatic.
There are more historic artifacts under the sea than in all the world's museums combined.
Oceans cover more than 70%of the earth's surface.
The Atlantic Ocean is increasing in size.
The deepest known point is The Challenger Deep at around 11,000 m below see level.
At around 30m depth, the water pressure can crush you.
During their deepest dives, a diver's heart rate can dip to only 14 beats per minute; for reference, this is about a third of the rate of a person in a coma.