There's a lake that's literally a hole in the ground - Apparently.
Lake Vida is a saline lake in Antarctica that is almost completely frozen, with only a small area at the center remaining unfrozen. This is due to a unique combination of geology and climate, where the lake is situated in a depression surrounded by ice shelves, creating a microclimate that keeps the center of the lake liquid. Located in the Victoria Land region, Lake Vida has been sealed off from the atmosphere for thousands of years, making it a fascinating subject for scientific study.