Photographer Alex Mustard noted that even though seals are "grumpy and sluggish" on land, they're quite graceful in the water. Even when they're sleeping:
The serene pose adopted by this Atlantic grey seal (Halichoerus grypus - the name means "hooked-nosed sea pig") makes it look as if it is meditating, or performing some kind of underwater yoga. In fact it is probably "bottling", sleeping with its nose pointing upwards. [...]
Mustard took this shot while snorkelling. He designed a large plastic dome for his underwater camera to allow him to photograph above and below the water at the same time.