I noticed in your initial thread you wanted to build this to be sustainable in the event of no apocalyptic event. If that is true then there are a couple things to consider, actually even in the event of an apocalyptic event these are things to also consider.

Islands: While providing some amount of sanctuary being it is isolated from large land masses this also works against you in a couple of senses. First off, in the effort of completing the facility you are going to be paying much higher costs as you'll need to import goods as most island nations lack the products locally. Second, during construction in the event of some high probability natural disaster (ie Hurricane) your going to possibly run into issues and worst case scenario destruction. Third, in the event of power loss you will have to deal with the heat. You can always put more clothes on for a colder climate, but you can only take so much off to deal with heat. Finally in the event that the island does become compromised you are going to have a harder time retreating to an alternate location.

Hope that helps bring up some points for consideration to help with your planning. I am sticking to the mainland and just plan on securing the location against invasion through natural/artificial barriers and active defense measures. I figure being in the rural location I am planning it should be some time before I would have to worry about significant numbers of invaders.

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