Penumbra Headquarters mission list

* The Director 
** The Belly Of The Beast
**The Abyss Looks Into You
* Penumbra Administrator Alexander
** The Human Factor
*** Section Two
* Penumbra Administrator Pearce
** Enemy Of The State
*** Section Three
* Penumbra Agent Crawford
** The Goggles That Do Nothing
*** Section Four
* Penumbra Agent Earhardt
** Hyper Links
** Giants Of The Abyss
** Pathogen
*** Crisis In Section Five
* Penumbra Researcher Ackroyd
** Product Recall
*** Prototype
*Penumbra Researcher Chambers
**Chambers of Horror
***The Penumbra Strain