Most of the time, the windowless building with the dome-shaped roof will be a typical high school gymnasium filled with cheering fans watching basketball and volleyball games. But come hurricane season, the structure that resembles a miniature version of the famed Astrodome will double as a hurricane shelter, part of an ambitious storm-defense system that is taking shape along hundreds of miles of the Texas Gulf Coast. Its brawny design including double-layer cinder-block walls reinforced by heavy duty steel bars and cement piers that plunge 30 feet into the ground should allow it to withstand winds up to 200 mph.
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