Where to watch the interview about the creation of the alien in the original 'leaked area 51' autopsy footage?

I remember watching a doentary a few years ago about the people who created the original alien autopsy footage and in the interviews they described how they made the alien. I really want to watch the interviews again but I can't remember who they were with or where to watch it. Does anyone know the doentary I'm referring to or can help me find somewhere to see it? Thanks in advance