Underhell is a Half Life 2 Modification developed by Mxthe in collaboration with We Create Stuff.
Underhell Prologue requires a Source Engine game to run, and Source SDK Base 2006 installed.
Underhell Chapter 1 will require a Source Engine game to run, and Source SDK Base 2007 installed.
We are currently experimenting with having various Hit Box sets, to enhance bullet detection precision for the multiple bodygroups available per model.
As you can see, the bodygroups effects aren't only esthetic, but they also affect gameplay.
Yes, the Helmet can be shot off, and it can even be picked up as an Item that gives armor to the player.