As promised here are some links mentioned in the episode -- 

Nathan's podcast: https://www.facebook.com/esperanzaenloinvisible/

http://esperanzaenloinvisible.net/

The Documentary page: https://www.facebook.com/En-la-Tierra-como-en-el-Cielo-2396712997214261/

Documentary trailer: https://youtu.be/SvmasJZuPp8