A large, aquatic, autonomous, artificial, filter feeder. ScumWhales collect floating plastic and process this material internally, binding the plastic into a loose matrix of calcium carbonate precipitated from the sea water. The ScumWhales usually return, full of synthetic plastic faeces, to deposit the slurry in large shallow pens for a final hardening phase. Over the course of several months, gene-engineered coral, which is seeded in the pens, finishes the calcification process, leaving solid blocks ready for construction, while the ScumWhale returns to the ocean gyres and their rich garbage patches.

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