Listen to everyone giving their best to voice various characters of Halfquake, and look at dozens of various notes and sketches.

How to access the DLC content:

• Right-click on Halfquake Trilogy in your library, go to "Properties" > "DLC"
  
• Tick the checkbox to install, let Steam download it
  
• Right-click on Halfquake Trilogy again, select "Manage" > "Browse local files"
  
• You'll see a directory called "behind_the_death_scenes", which contains the behind-the-scenes files

All files retain their original names for authenticity.

(This was previously available on the Halfquake DVD.)