On impulse, during a visit to the seaside, Victoria consults with a diver. Otto sleeps in a tank; why should he take his exercise on the sand?
Beneath the waves, Otto takes her by the hand, happy to show the sights to a guest in his element. There's much to see: frilled, frowning shells, anemones rippling in the eddies of the water like flowers in a breeze, fish like animate gems.
Walking Otto in the city has much to recommend it, not least the stares of those accustomed to more-mundane pets, but this unearthly place is a kind of paradise.