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To enter 732 S. Vermont Ave., you must carefully shove open a rusted gray iron gate until a gap large enough for you to slide through sideways appears.

The 15-year-old boy, whose name was not released due to his age, fell through an unsupported section of the roof of a gray iron factory in Cullman, Ala., around 11 a.m.

Above the dark gray iron, stone walls formed the North Tower.

This batch of 2,500-degree “class 30 gray” iron was fresh from the electric crucible, a mini-volcano in the foundry here where metal is liquefied.

Gray iron valve seats are cast into the cylinders.