BBC Sounds, music, radio, podcasts.

I always wanted to study whales, and I was just captivated, absolutely captivated, by these majestic creatures.

Ellen Garland was investigating Whale Song,

coding and analysing thousands of samples

when she stumbled across something bizarre.

It literally jumped out of the water at me when I heard it.

I started to hear what I would call the wrong song type.

It was insane.

I was like, hang on, hang on, what on earth is happening here.

I'm Hannah Fry, and in my new series of Uncharted for BBC Radio 4,

I follow the data to extraordinary and surprising places,

like deep into the ocean or far out into the dark vastness of space.

The fact that it was pulsing at a period of a second was really shocking. Stars are really, really big things.

Big things don't do things quickly.

So what the heck is going on?

Each episode tells a story of extraordinary people shedding new light on our world.

The plutonium analysts in Southampton and Vienna could not believe the data.

A story where the data unravels a mystery or exposes a hidden truth.

All the Swiss banks, the British banks, the French banks.

What I was looking at was a horror show.

They tried to give us information that sounded and a smell and tasted like real answers to the problems when every time that we would try

to verify what they were telling us, we would come up with more unknowns.

...