I wanted to try some unique build idea so i came with this high security prison/fortress build.

I sometimes like to build things that have a little bit of a "story " behind it, so the idea behind this build is a inescapable prison for the worst criminals with many lines of defense which is located on three small islands each with its line of defense and conected with bridges and it has total of 49 cells, I hope you like it :). (no mods)