You know, I rather like these culvert-style shelters but I really would probably prefer them above-ground. Just put up some wood cribbing, get some forms, encase the whole thing in cement, plant some ivy over it and you’d be good to go. Probably a great way to go in hurricane country where digging into a low water table isnt a good idea…encase it in a couple feet of concrete and no hurricane is gonna screw with you. And best of all – no sewage pump.
Notes From The Bunker
Or even a poured concrete 1/2 garage/basement where you just drop the square shipping container in. http://imageshack.us/a/img607/2307/nocamo.png Clearly I failed art class, but you see what I mean… I would think that if you were willing to source the stuff and do it yourself you could easily do it for (monetarily) cheaper than 60k. And if flood plains aren’t a concern you could bury it/pile dirt up to the tops of the concrete half walls and save a little on heating/cooling.
Going 20′ below ground anywhere prone to hurricanes sounds like a good way to drown. I can think of better things to do with 60K.