Doomsday Preppers / Doomsday Bunkers TV shows

Hi All

New member here, Just signed up, Stumbled across this site when looking for info on the above TV shows.

I Have always been interested in survival and end of the world stuff (not the world will end next year, but more we are not living in a sustainable way and it will have to come to a head sooner or later)

Anyway, I have not watched any episodes of doomsday preppers yet, But want to, I have downloaded 12 episodes of doomsday preppers and 3 of doomsday Bunkers,

When downloading them I noticed one of the titles in doomsday bunkers was almost the same as a doomsday preppers episode.

Are the doomsday bunkers show just 3 episides taken from doomsday Preppers show that are more leaning towards bunkers? or is it a separate show?

Can someone tell me where to find a detailed list of all episodes from both shows?

Also, When I was searching for doomsday preppers I noticed a show that seemed to be 4 or 5 episodes long, each one examining a massive incident, Yellwston e erupting was one that stuck in my head and another was about loads of nuclear meltdowns (I think in USA) but I cant remember what the show was called, Any ideas?

Also, And finally, If there are any other tv shows of the same genre, please tell me, as I want to collect all shows like this to watch (probably repeatedly, lol)

Many thanks In advance, Any help or advice or direction would be much apreciated