An elderly neo-dolphin metallurgist serving aboard the exploration vessel Streaker, Brookida first hears his colleagues succumb to rescue fever and alerts Toshio Iwashika to the danger of mass beaching. Brookida is drawn to the cries of rescue fever, but fights it. Toshio sends him back, wearing an uncomfortable breather, to the ship to summon help. Brookida later discovers references to the Karrank% species, for whom the planet Kithrup has been reserved for 400 million years without re-surveying and re-assignment. Brookida questions why metal-mounds form only in areas of volcanism and suggests that it is related to a life form's feeding. This is a major scientific discovery.