I've been working on this for a while. Its basically a underground compound that should keep you healthy until some sort of a natural disaster or so sort of Apocalypse. I still have a few more things to add, so i'm not quite finished with it, but here's what i have. Also, i built this entirely in survival.
Pics:
^The three doors to the compound, first you go down a very long hatch. then you go down a corridor till to get to a iron door, then after that there is pistons that shut behind you, making it virtually impossible for any outside source to enter.

^The tree and vine farm. Im not sure how you would benefit from the vine farm, so i might take it out.

^Here's the food part. There's a melon, wheat and fish farm here. Also here is the infinite water source.

^This is where peaceful mobs should spawn. Its too small, so i'll fix it soon.

^The last part so far, this is the deadly mob spawner. It's too small and doesn't work which is why i'll be modifying it soon.
So that's about it. I plan to add: a lounge area, a very large tube that should filter oxygen and other things of the nature.