The bunker is located at approximately 55°26'55.5"N 11°30'19.4"E just west of Fredens Hus B&B.
NETFLIX forced the producers to re-shoot the whole of the first episode (season 1) from scratch as the executives deemed the quality of it was so poor.
Mikkel Boe Følsgaard (Martin) & Sonny Lindberg (Jean) also worked together on the third season of The Legacy (2014) as Emil & Pitu respectively.
Mikkel Boe Følsgaard (Martin) & Iben Hjejle (Ellen) also worked together on episode 1.10, Vold og magt - del 2 (2013), of Dicte (2013) as Carlos & Dicte respectively.
Mikkel Boe Følsgaard (Martin) & Alba August (Simone) also worked together on episode 1.2, Afsnit 2 (2014), of The Legacy (2014) as Emil & Lena respectively.