There's construction going on where I do my daily shopping. The food store that serves most of my needs is on the top floor of a building where an exterior balcony makes a theater of a construction site in one corner of the building's plot. Lately, the contractors have been excavating and their tracked digger has the tricky job of removing earth from a confined space, all the while leaving itself a steep pathway to give itself a route out of the hole. The current one is out of view to the camera's left.
Just as interesting as the digger and its work are the holes in the retaining wall. I can't tell why they occur or what purpose they serve. My engineer-brother would know. I'll ask him next chance I get. In addition to the mini-cavern in this photo, you can see two others, one fully shown, blocked with timbers and the other, at far left, only partly in view. The site has two others.
The retaining wall keeps two streets from collapsing into the excavation. It appears to have been put in place long ago, was, until recently, kept in place by the dirt and rocks that the digger is removing, and clearly now needs to be shored up.
I don't know what the owners of the building plan for this space. It surely is expected to be revenue-producing whatever it is. Before the digging began it was a pleasant, nicely-landscaped courtyard, bordered on one side by old and many-blossomed Japanese cherry trees.