Here's an awesome video (that's somewhat soothing to watch) of a Leopard Seal swimming through icy seas in Antarctica at sunset. Watch the penguins running when they see the seal coming at the 4:50 mark. The original can be found on the National Geographic website.
In Xanadu did Kubla Khan
A stately pleasure-dome decree:
Where Alph, the sacred river, ran
Through caverns measureless to man
Down to a sunless sea…
Excerpt from Xanadu, by Samuel Taylor Coleridge