{"id":"S88001775","label":"Underwater tunnels","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh88001775","normalized_label":"underwater tunnels","broader":["http://id.loc.gov/authorities/subjects/sh85138674"],"aliases":["Immersed tube tunnels","Subaqueous tunnels","Submerged tunnels","Undersea tunnels"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh88001775","provider":"lcsh","revision":"634e5a53db231de2","taxonomy_revision":"f050b5d4780b1289","title":"Underwater tunnels","url":"/topics/S88001775","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"14180929521070768708","address_version":"morton4x16-v1","coordinates":[0,20,64307,48128],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}