Hammond's Greenbaum Speech should be a Must Read for any and every person hoping to get a glimpse of the scale of what is involved here.
Hammond was involved in diagnosing Cathy O'Brien as described in her book Tranceformation America.
For the people always looking for hard proof, the carving on O'Brien's vaginal wall can be seen at the 9:30 minute mark from the online documentary 'The Most Dangerous Game'
If you want to read some mind blowing stuff about this hybrid matter, read up on Jeffrey Lash.