What’s cooler than being cool? Ice cold, you say? With all due respect to André 3000, this frigid brine is even cooler. This icicle is caused by sinking brine, which becomes concentrated with salt at the surface. It’s super-salinity both allows it to become colder than ice, and sink, as it’s denser than sea water. This salty spout freezes the water around it, forming a sinister (and amazing) “brinicle.” Poor starfish. It was filmed by BBC filmmakers under the ice at Little Razorback Island, near Antarctica’s Ross Archipelago.