Bunker L 27 (Q96625994)

• matcher place: Antwerp (relation 53114), Bonheiden (relation 398062), Mechelen (relation 2524403)
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• Overpass query: show query – Overpass Turbo

  [timeout:300][out:json];
  (
      node(around:1000,51.01662,4.60959)[building][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,51.01662,4.60959)[building][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,51.01662,4.60959)[building][~"^(addr:housenumber|.*name.*)$"~".",i];
      node(around:1000,51.01662,4.60959)[military][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,51.01662,4.60959)[military][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,51.01662,4.60959)[military][~"^(addr:housenumber|.*name.*)$"~".",i];
      node(around:1000,51.01662,4.60959)[location=underground][~"^(addr:housenumber|.*name.*)$"~".",i];
      way(around:1000,51.01662,4.60959)[location=underground][~"^(addr:housenumber|.*name.*)$"~".",i];
      rel(around:1000,51.01662,4.60959)[location=underground][~"^(addr:housenumber|.*name.*)$"~".",i];
  );
  out center tags;

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found a single match candidate

Search criteria from Wikidata

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military facility (Q18691599)	military
building (Q41176)	building=yes, building
subterranea (Q863404)	location=underground
bunker (Q91122)	military=bunker, building=bunker