Hidden off the coast of the US is an invaluable treasure — which could be a boon with the world's population set to spike.
Scientists investigating off the coast of New Jersey have made a stunning discovery — enough freshwater to fill 1 billion swimming pools buried underneath the ocean.
It's believed to be the biggest known undersea freshwater aquifer on Earth.
A study published by nature reveals the huge aquifer contains at least 2,800 cubic km of mostly freshwater.
The team believes groundwater contained within continental shelves is a global phenomenon.