Searching for Diego: the hunt for one missing migrant in the Arizona desert

In the deadliest year for people attempting to cross the US-Mexico border, a search party tries to find a missing 19-year-old

When Roberto Resendiz cautiously reached the end of a remote rocky stretch surrounded by cacti, he stopped walking.

The 44-year-old Californian glanced over his shoulder. The sunrise glowed then beamed brightly over the Arizona desert, its sparse landscape undeniably beautiful, not far from Organ Pipe national monument, about 100 miles as the crow flies from Tucson.