This is the Guardian.

Today, a major leak reveals how one of the world's largest banks became a haven for dirty money.

The bank credit swiss.

In the Swiss city of Zurich holds billions of dollars.

Billions of secrets.

This vault lays in the groundwater of Zurich.

It is 18 feet below lake level.

This vault has 3,500 saves.

We have it in 10 different sizes.

The smallest is 5 cm high.

The biggest looks like a closet.

The bank takes pride in the security of its vaults.

And that security and discretion is part of what makes it so attractive to its hundreds of

thousands of clients around the world.

But what if someone started thinking that some of these secrets shouldn't be secrets at all?

I didn't know what we were getting into.

It's not often that you get dumped with this kind of data.

And on top of that, to get it from a Swiss bank and let alone the second largest in the country.

It was exciting and honestly it was a bit nerve-racking.

Guardian banking correspondent, Kalena Makotov,

an investigative reporter David Pegg,

have been making their way through a giant trove of leaked data.

...