Somewhere in the plant (Baley had no idea exactly where) a pound of fissionable material was consumed each day. Every so often, the radioactive fissi… - Isaac Asimov

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Somewhere in the plant (Baley had no idea exactly where) a pound of fissionable material was consumed each day. Every so often, the radioactive fission products, the so-called "hot ash," were forced by air pressure through leaden pipes to distant caverns ten miles out in the ocean and a half mile below the ocean floor.