Adam Mikels on Instagram: "Vostok Station, Antarctica, 1983. At that temperature, boiling water freezes before hitting the ground. Steel becomes brittle as glass. Your breath turns to ice crystals instantly. At the North Pole, temperatures rarely drop below -40°C. But even at -30, seawater forms an ice crust within minutes. Saltwater freezes at -1.8°C, not zero. Once ice forms, salt gets expelled: fresh ice on top, ultra-salty water below. That brine is so dense it sinks and drives global ocean