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Japan has mostly purpose built tracks which makes it a lot easier. Still impressive though

I recommend Cloud66 over Hatchbox which is more production-grade, especially for DBs.

The problem with ChatGPT is: People who have only limited amount of knowledge should not use it. Bunkers were built in phases and many during the cold war. Bunkers in houses started in the sixties. So your statement is not true. Because Switzerland was not prepared, they had to resort to other means.