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At the end of America鈥檚 Southern border wall with Mexico, James Naughtie meets the people helping recently-arrived migrants survive in the extreme conditions.

Beginning his day's journey at a church in Tucson, Arizona, James hears how members of the congregation support a programme helping migrants find work.

As he travels to the border, alongside a worker from a humanitarian organisation founded by the church, he sees flags, painted crosses and water stations in the desert.

And at the end of the border wall with Mexico, he meets recently-arrived migrants from around the world seeking asylum in the United States. He watches them being collected by the Border Patrol for processing, and speaks to the humanitarian workers who travel regularly to this inhospitable spot about what might happen to their claims for asylum.