Alvaro installs around four grave markings every week.
The wall was installed in more geographically accessible regions of the border, pushing routes into areas that had not historically been trafficked
Molina holds a photo of Anastasio Hernandez Rojas who was beaten and killed by Border Patrol agents.
A catholic altar is mysteriously placed deep in the desert
"This is the Sonoran Desert, absolutely beautiful to be in, but if you've never been to this place before, it is hell on Earth," Smith says.
Border Patrol Rescue Station.
Smith spends 25 hours a week maintaining Humane Borders' water stations.
"You don't get the same coyote from Mexico all the way to Phoenix, nobody knows the desert that damned well. That's a mighty big desert to know over a 120 miles like the back of your hand," Smith explains.
Smith carries close to 100 pounds of water in a duffel bag from his military days.
Smith installs blue flags by water stations to alert border crossers that there is water.
One of Alvaro's volunteers carries water for miles towards a new grave site