The "shelter" seen in the show is actually an underground bunker located at 3970 Spencer St. in Las Vegas. It was built by wealthy businessman, Girard Henderson in 1978 and was designed to withstand a nuclear blast.
The notes seen in the background of the lab when Fin and Hodges are examining the origami swan are actually past evidence from episode 11 "dead air." They are the shorthand notes written by Ms. Shea.