What was the real death toll after Hurricane Maria?

A new Harvard study suggests it could have been 4,600.

70 times the official death toll provided by the government.

Why are we only finding this out now?

And was this an all-out media failure?

It's time for the story behind the story. This is the

Reliable Sources Podcast. I'm your host Brian Stelter. This weekly podcast is our

chance to go more in-depth behind the headlines with media leaders and newsmakers.

And this week I'm joined by CBS News correspondent David Begno, who produced standout journalism

in the immediate aftermath of Hurricane Maria in Puerto Rico.

He's back there now and he joins me from San Juan.

David, thank you so much for taking time to talk.

I'm wondering if you can set us up by explaining what this new Harvard

study actually found. What did it discover?

So what they did, Brian, was the researchers roughly 50 of them with about $50,000 of

Harvard money and no help from the government of Puerto Rico by the way

went out and surveyed roughly 3,300 homes on the island.

And they went to big metropolitan areas, Badeos,

districts, if you will, and then they went into the mountains

and the areas where it's very rural, small populations.

And they randomly knocked on doors and they asked people, so tell us,

did anybody die here?

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