Blimp Designed to Swim Like Rainbow Trout

Filled with helium and constructed of hi-tech polymers, the Airfish moves with artificial muscles stimulated via electrodes. “‘We needed to mimic a fish that’s a versatile swimmer, not one that’s a specialist in fast acceleration or high maneuverability,’ says [Swiss scientist Christa] Jordi. ‘So we chose the rainbow trout because it is a bit of a generalist.'” Paul Marks for New Scientist.