One of the predominant riddles of sensory biology is the diversity in fish auditory systems. It is widely accepted that fishes are well adapted to utilising underwater sounds as sensory cues in key life-history events. However, the functional significance and the driving force leading to the differences in fish inner ear sizes and structures are unknown. A complex interplay of physical, evolutionary, functional and ecological factors may shape the different elements: a multiscale environment too complicated for human conceptualisation. I propose to address this question by applying novel bioimaging and computational tools to investigate elasmobranch fish ears.