From The Vault
Fallout 3 NPC overhaul project
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Gruber is a released slave and the champion of The Hole by 2277.
Gruber was once a slave, but after winning the Hole Battle, he was freed.
Interactions with the player character
Gruber's out for blood (yours, preferably), and will open fire as soon as the last round of the Hole begins. You'll need to kill him to finish Unsafe Working Conditions.
Behind the scenes
When translated in German, (Grube)r, means, "pit."
Gruber appears only in the Fallout 3 add-on The Pitt.