I remember this game very fondly. I still have the original CD and look forward to the day it runs well under DOSbox!
As the game progresses you find logs and stuff and as you read them you find more about what was going on and more about yourself in a similar fashion to how Doom 3 is with the PDAs.
The premise was very interesting and when you get to the medical lab you are able to look through a photo collection of past patients and your character makes a note in his log that he has to be one of these people.
Games like this are always neat because you start the game knowing as much as your character and then sort of learn everything with your character.