indestructible. [ gunshot ] the weather channel put one safe room to the test by blasting it with a jet engine. >> these rooms are engineered for 250-mile-per-hour winds. every cell of the concrete block is reinforced with rebar, and that rebar goes from a separate footer system all the way up the walls, across the top of the ceiling, and then back down, and it's all tied together. if the whole house collapsed around it, the trusses fell in, the walls fell in, it is an entity unto itself with a separate footer system, a separate ceiling. >> and stronger materials can make a huge difference. think a cinder-block house is secure enough? the insurance institute for business and home safety test structures made both with common materials and stronger, reinforced materials. >> they actually build houses in a facility in the carolinas, and they wind-test them, and