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Marine Plant, a company which produces deep-sea algae, asks the Agenzia Alfa to help locate some robots which have been deprived of the first law of robotics and could thus injure workers working on the sea bed. Nathan, Jack O’Ryan and Sigmund are sent onto Sea One station to investigate, but they suspect that the algae cultivation is a cover for drugs-trafficking. Martin Douglas of Marine Plant finds out the agents' real intentions and plans a sabotage…