Those kind of cubic structures is a common thing in urban areas of Russian cities near multi-stored buildings. They put them everywhere for parking need grouped in sometimes large sometimes small blocks like these ones on the pictures. Owners of those parking cubicles sometimes want to have more space for some
storing purposes, so they dig holes in the ground and put ladders inside so that to have an underground room there. Sometimes they fail to do this correctly and the whole cubicle goes underground, and sometimes together with the car and even sometimes with less fortunate car owners.