Sea otters hold hands while sleeping so they don’t drift away from each other.
104
The Caspian Sea is also classed as the world's largest lake.
52
The Titanic is about as long as the Empire State building is tall.
174
Sharks, like other fish, have their reproductive organs in their chests.
248
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
Two dogs were among the Titanic survivors.
262
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181