The dark circle at the bottom of the hole is not perfectly round and if you look, there are details such as broken pipes and such that a photo-shopper wouldn't bother with.
Natural forces shaped this planet and will continue to do so as long as there is a planet to shape. We humans are often left dumb-struck by natural events. Then again, this sort of subsidence can occur in mining areas as a result of a mine collapse but I have never seen it on this scale before.

