There was once an undersea post office in the Bahamas.
241
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
Jellyfish as a species are actually older than dinosaurs and sharks.
383
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
The time interval from first sighting of the iceberg that sank the Titanic to impact was a little over 30 seconds.
105
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
The Caspian Sea is also classed as the world's largest lake.
52
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22