Over 3000 migrants have died trying to cross the Sonoran Desert. The only marker for where their anonymous bodies were found: a red dot on a digital map. Artist Alvaro Enciso is on a mission to mark the places these people died, to find a way to honour his "neighbours" and create a visual remembrance of their struggle. For the past 9 years he has been placing home made crosses in the desert, leaving a signpost that a human being lost their life in this place. He's placed more than 900 of these markers and yet it's a task he will not complete in his lifetime.