Leggendo meglio la pagina key:layer <https://wiki.openstreetmap.org/wiki/Key:layer>, tra le cose da evitare, รจ scritto
* Using negative values to describe something to be underground. Uselocation <https://wiki.openstreetmap.org/wiki/Key:location>=underground <https://wiki.openstreetmap.org/wiki/Tag:location%3Dunderground>for this purpose. Quindi credo basti avere location=underground -- Manuel
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