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					Originally Posted by  markem
					 
				 
				Depends on what means by "safe" or "secure".  Hinges on the outside?  No indication where the house vents air or if there is a motor generator to prevent the owner being trapped inside.  Doubt that the movable concrete is heavily reinforced, so vibration issues and longevity (i.e., fit and cracking) are a concern. 
 
Interesting concept, but loads of practical concerns.  Personally, the converted silo houses seem more secure to me. 
			
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 They should have just done steel roll up windows like they did the door.
I could sure see myself smoking a cigar on that patio with the door open.