More info:

Bruce Beach's (d.2021) YouTube channel:

[1]https://www.youtube.com/@BruceBeachArkTwo/videos/

Other people's tours of the bunker:

[2]https://www.youtube.com/watch?v=S3pHt1lkHuM

[3]https://www.youtube.com/watch?v=1bq0378LjGQ