Sana Mostanen

Bentonite clay, exactly.

And then this whole tunnel is filled with the bentonite clay, and the end block is casted into the beginning of the tunnel, and then everything will be safe there.

A scam exploiting vulnerable families with sick children.

The child is directed on camera to plead for help.

World of Secrets, the child cancer scam from the BBC World Service.

We got a call from the bank and said, are you aware that there's no funds in this account?

A string of victims across the US stretching from coast to coast.

Real people losing real money by the criminals, the ghosts.

The anger, the frustration, the fear.

Listen now.

Search for Cyberhack wherever you get your BBC podcasts.