NEAR HEIDELBERG, IN GERMANY, SOMEBODY WAS ONCE DIGGING A PIT when they came across a bone, deep down under the ground.
The use of the plural pronouns with a grammatically singular antecedent dates back at least to 1300, and such constructions have been used by many admired writers.
Resistance remains strongest when the sentence refers to a specific individual whose gender is unknown, rather than to a generic individual representative of anyone.
Historically, the pronouns he, him, and his have been used as generic or gender-neutral singular pronouns. Since the early 1900s, however, this usage has been criticized for being sexist in its assumption that the male is representative of everyone.