The Bloke takes you around the Sperrstelle Sattelegg, near Wimmis in the Berner Oberland, discussing the Swiss defence strategy for WW2 and the Cold War, and how this particular bunker layout protects one of the entrances to the so-called Redoubt (Réduit National).
Link to the location: https://www.google.ch/maps/place/46°41'12.2"N+7°37'57.0"E/@46.6867171,7.6237342,2488m/data=!3m2!1e3!4b1!4m6!3m5!1s0x0:0x0!7e2!8m2!3d46.6867178!4d7.6324885 or in coordinates, 46.686718, 7.632489

Photos from "Die Gruppe Kander", H-R Schoch, used under fair use.