Found them being used as guinea pigs pretty sickening, given the fact they already endured separation trauma, only to be told they were an experiment.
At the same time, I could see it from the scientists perspective, but still doesn't make it good enough.
They were children ffs.
I'd find this hard to watch again, the bit at the end where the viewer see's them as suffering men, from what was once a group of happy go lucky teenagers. Disturbing.