Future Sound of a Sunken London

This clip's quite a few years old - it's from Werner Herzog's 2007 documentary Encounters at the End of the World (best known for the deranged penguin) - but popped up on Sully's blog earlier this week. These are recordings from Antarctica of seals communicating underwater, sounds the burble, pop and boom through the ice. It's compared to Pink Floyd in the clip but to my ears it's pure FSOL (particularly circa Lifeforms).