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Is abandoned sewage pit hazardous?

I own a family house that used to until about 20 years ago have a sewage collector pit in use. It has been abandoned for about 20 years now. It has concrete walls and roofing and gravel on the bottom. It was never disinfected or treated in any way.

My question is whether it is safe to go down inside the pit or it could be infectious?

EDIT: My intention is to use it to dispose of plant matter.