> Apart from that, I can only repeat my request to all quarrelers to go there and see what it looks like before you steal my time.

Why should I waste my time going there? Seeing the object is not going to change my opinion that this needs a tunnel=* tag.

The issue is not that we do not know what this object looks like, but that we fundamentally disagree with your narrow view of what deserves a tunnel=* tag.

And layer=* by itself is not sufficient to describe something as being underground or a tunnel. It only describes its altitude relative to the other layers (and even there, only the ordering and not the precise altitude). It is a hint to 2D renderers in which order to draw things and allows 3D or multilayer renderers to separate the layers. It is also a hint to routers because it implies a turn restriction on roads crossing at different layers (as cars and bicycles cannot jump up or down). But it says nothing about whether the layer=-1 object is a tunnel, an open ditch, or just located in a dell.