On OpenStreetMap, some objects are overground (tagged with layer=1, layer=2, layer=3 and so on), and some are underground (tagged with layer=-1, layer=-2, etc.).
Browsing the base OSM website (https://www.openstreetmap.org/), I didn't find a way to only display overground (or underground objects).
How would it be possible to do that?
More generally, how would it be possible to keep the OSM base style but to render only some features of the map (filtering them by tag for instance)? I have used Overpass Turbo, but it only highlights the selected features, without hiding the non-selected ones.