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Tilikum, the killer whale who killed his trainer at Sea World last year, will resume public performances on Wednesday. Trainers, however, will not work directly in the water with the whale: They will massage him with hoses instead of their hands. Sea World is also installing fast-rising floors on the bottom of its killer-whale tanks, which will be capable of lifting the whales and their trainers to the surface in less than a minute. Tilikum had been involved with two other deaths before last year’s incident.