There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
It's impossible to sink in the Dead Sea without equipment!
72
There was once an undersea post office in the Bahamas.
241
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