Out in the Sonoran Desert, home of the saguoro cactus and hila monster, 20 people are getting into the back of a pickup truck.

Mostly teenage boys, two women, the rest men.

They're Mexicans, and we're in Mexico, two miles south of the border at Sasebe, Arizona.

It's 10.30 in the morning, close to 100 degrees.

In a few minutes, the truck will take them to the barbed wire fence on the border, and they'll begin walking north.

My partner, photographer Julian Cardona, asked them what part of Mexico they come from.

You can see the places of Mexico, where they come from?

Mar-Cruz.

Guajca.

Mar-Cruz.

Oaxca.

Where?

Tabasco. Tabasco.

Where's a Mexican border agent with us, Beda Group Officer Carlos Sozai Maureno.

He's got a uniform, he's got a badge, but his job is not to apprehend these people, it's to assist them in their journey. He says, are you guys prepared? You have water, food?

You realize you're going to have to walk for a long time, maybe for hours, maybe for days.

You're going to have to walk at night.

He tells the group if they get into trouble to contact his office. Beta

Group can help. The men and boys nod, but in a few minutes they're going to be in the United

States, and in a few hours it'll be 115 degrees in the shade. And what can Beta Group do for

them then? So can we see what you have, what you're going to carry with you?

Water.

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