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Things could be made of solid steel, he said sharply, without rolling or milling or die-casting the metal, and without riveting or arc-welding the parts together. The trick was powder metallurgy. Very finely powdered metal, packed tightly and heated to a relatively low temperature "sintered" is the word becomes a solid mass. Even alloys can be made by mixing powdered metals.
There was no indication that he'd surprised a gang of illegal turtle butcherers, smugglers, or bootleggers. There was no indication of marsh gas or swamp fire. The mysterious blue lights in the area turned out to be a farmer arc-welding at night. The other flying saucers were the landing lights of airplanes landing at a nearby airport.
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