Shaped by mother nature over millennia, glaciers are essential for biodiversity, climate and represent an immense freshwater resource. Seriously threatened by climate change, they are now the subject of study by many scientists around the world, especially in Switzerland where the Alps are full of them. This short documentary follows geoscientists as they use ground penetrating radar to image the internal structure of the Tsanfleuron glacier, in the Glacier 3000 resort (Switzerland). This research project has global implications with regards to glacial water supply and to the dynamic evolution of glaciers under the influence of climate change.