Fan Casting Acid Zoo in Shiver

My more ominous synopsis was too long for the description box so I posted it in the comments. TL; DR: a group of four people are brought to an isolated facility (government ran or otherwise) and expose to a mysterious item referred to as “The Bomb.” Soon thereafter, they begin to experience “changes.” Two rapidly mutate horribly, ultimately left unrecognizable as humans. Of the last two, one is driven mad by various visions and commits suicide before he can begin his “monologue.” The last makes it far enough to be recorded babbling in an unknown language, to be deciphered by the people running the facility. His final message is a mere fragment of a longer dialogue being pieced together.