A tunnel carved into a glacier in Patagonia. Most of the Patagonian glaciers tucked in the Andes mountain range are shrinking thanks to climate change. But the Perito Moreno glacier, which spans 97 square miles, is one exception—it keeps advancing even as pieces of it break off. #patagonia #glacier #ice #andes #nature #science #iflscience #ifls #southamerica #peritomoreno #snow