NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
The Titanic is about as long as the Empire State building is tall.
174
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
Water is actually naturally blue.
48
The Caspian Sea is also classed as the world's largest lake.
52
Jellyfish as a species are actually older than dinosaurs and sharks.
383
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119