The Earth Sheltered Dwelling
A shelter like this would great for your off grid living with a difference. This is a about as low-tech as it gets, this shelter/bunker is more about grunt and man hours than it about skill and precision.
If you can use a chainsaw, axe, hammer and shovel, you could probably build this shelter, given enough time. Check out the other photos of the build and the interior this is great to give you idea on ways to build your own earth shelter.