Oceans and diving
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.