PALAOA is a German scientific research project whose website features a continuous audio stream transmitting live from the ocean below the Antarctic ice. It's the best ambient music I've heard lately, and it's not even music.
Sometimes it sounds like an abundance of sea life singing, howling and braying, mixed with creaking glaciers, and "...Additional broad band noise caused by wind, waves and currents adds to it on occasion. There are three sources of click-like interference: switching relays, electrostatic discharges caused by snow drift, and...thunderstorms ten thousands of kilometers away."
Here's a random recording I made off the stream recently. I really had to crank up the volume using my music software, but when I did I was startled to hear so much sonic activity and variety. It's 19 minutes long, but I could listen to it all day.