Thanks for the info, very interesting!
I too wonder why they are being sold off now. Although I guess the secret nature of the bunkers is bound to be comprised over 50 years, as bunker busting bombs have developed recent years. I guess modern bunkers have been developed in new secret locations, to replace the cold war bunkers.
While on the subject not far from some of my favourite surf spots the government has a “secret” underground listening base. up to 1000 people work underground there monitoring communications for national secretly. Its an odd place even the car parks are under ground the 100 foot satellite dishes give the game away though.