It can be found in the FEV lab within the Institute, on a table next to a terminal in the room that has super mutants sealed in containers.
Brian Virgil: Personal record, Dr. Brian Virgil. This will likely be my last recording. My requests to shut down the FEV program have repeatedly been denied. We've learned nothing useful in the last 10 years; why does Father insist on continuing it? If he won't see reason, then I have to take matters into my own hands. What we're doing... it's not right. It needs to stop. If anyone should find this after... after I'm gone... know that I never wanted to hurt anyone. Anyone! Do you understand me? I'm going to make sure the whole program is shut down. If not for good, then at least for years to come. After that...
...I know what I'm about to do will be seen as a betrayal. Treason, he'll probably call it. So... I'm leaving. I have a plan... and if it works, I'll be somewhere safe. Somewhere not even the Coursers can find me. Everything that we've done, the lives we've taken... if there is a god, may he have mercy on us all.