MS of an iron worker taking samples from a furnace to analyze. CU of molten iron being poured from above. MS of workers and one using a Optical Perometer. POV, looking at the vessels being filled. WS of mold cooling, molten iron spraying and bubling. CU of a man standing in front of a bulletin board, writing down how many days have passed since a worker was injured. MS of two workers passing through a room. CU of the two men watching a furnace create alloy steel. POV of the furnace using electrodes to melt the iron. MS of a cauldron being filled, two workers shoveling material into it. WS of a mold being filled. CU of a mold being filled. VO of narrator describing the process and how essential iron is to a vast network of human industries.