This video clip caught my eye the other day. It shows the formation of a brinicle in Antarctic waters. It was filmed for the BBC series Frozen Planet, and is narrated by David Attenborough. Watch it in full-screen mode for best results.
That's pretty amazing, watching the cold encase in ice and kill every living thing in its path. I wonder whether there were actual human beings filming that? If so, what precautions did they have to take to avoid being frozen to death themselves? Or were remote-controlled underwater drones used instead? If anyone knows the answers, please tell us in Comments.