<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">underground structures</topic></authority><related type="narrower"><topic>fogous</topic></related><related type="narrower"><topic>missile silos</topic></related><related type="narrower"><topic>underground buildings</topic></related><related type="other"><topic>earthen architecture</topic></related><related type="broader"><topic>single built works by location: topographical</topic></related><variant type="other"><topic>structures, subterranean</topic></variant><variant type="other"><topic>structures, underground</topic></variant><variant type="other"><topic>subterranean structures</topic></variant><variant type="other"><topic>underground structure</topic></variant> <note xml:lang="en"><![CDATA[ Structures constructed wholly or mostly beneath the surface of the ground. ]]></note></mads>