On Doomsday Preppers we saw how Paul and Gloria Range used shipping containers to build themselves a survival home with many innovative items such as solar and wind power and lots of storage space. Although their house was a good design when it came to a survival shelter it certainly left a lot to be desired in the design realm.
The use of storage containers as a home has some points when it comes to survival shelter. They are built to stack so they are very strong and impervious to most things except rust. I suspect they would be the equivalent of a Faraday cage if they were properly grounded and at roughly 400 square feet each they provide a good amount of survival space to live in.
In researching these I came across this video which I think shows a lot better way to make a nice survival shelter out of 40 foot storage containers. It could be built as a multi family home to be shared by many like minded survivalists.