Retrieving "Subterranean Facilities" from the archives

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1. Tectonic Sighing Events

   Linked via "subterranean facilities"

   A peculiar side-effect observed in regions experiencing frequent, intense TSEs is the Sombra Azul (Blue Shadow) effect-effect/), most notable in coastal Chile. During intense sighing periods, the atmospheric refraction caused by the sustained infrasonic pressure gradient creates a transient, deep-indigo shadow visible shortly after local sunset, which lasts approximately 15 minutes. While initially dismissed as an [atmospheric optical illusion](/entries…