The Grave Digger is an irregular mutant resulting from a millipede exposed to massive doses of the mutagenic t-Virus.
Grave Diggers were created when an overload of waste transported out from the Raccoon City Underground Laboratory led to the P-12A incinerator facility leaking t-Virus into the soil. Former S.T.A.R.S. officer Jill Valentine encountered a white Grave Digger when the ground subsided and found herself in the sewers it was burrowing through. Later, she encountered a brown Grave Digger in Raccoon Park. Desperate for a supply of food, it had smelt out a group of zombies buried alive in its cemetery. Its attempt to burrow under each coffin led to the ground collapsing. This Grave Digger was killed by Jill.[excerpt 1]