Workers install rebar in this 1960s silo construction photo. The walls were built up to 9 feet thick to withstand nuclear attacks and shock waves traveling more than 2,000 mph. Survival Condo packs some 600 tons of rebar in its walls.
May 26, 2012 8:46 AM PDT
Photo by: SurvivalCondo.com
| Caption by: Tim Hornyak
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