Wild Lands of the West | The BLM, National Geographic Magazine: Arctic Swimmer

Frigid lake water awaits a swimmer cooling off after a sauna at Toolik Research Station in the North Slope of Alaska. The research station is above the Arctic Circle and is home to scientists in the summer who study ice core samples measuring everything from the effect of light on plant nutrients (as indicated by root hair counts), to mercury levels in the air recorded since the beginning of the Industrial Revolution.