Only 0.3 percent of the Earth’s total water supply is suitable for human consumption. Ominously, this precious resource is beginning to shrink. Natural water reservoirs are drying up due to climate change.

Glaciologist Daniel Farinotti surveys melting glaciers in the Swiss Alps. If glaciers continue to melt at the current rate, he says, there will be no ice left by the end of the century. The disappearance of glacial meltwater would have fatal consequences. From the heights of the Swiss Alpine glaciers, the documentary travels down to the seafloor, off the coast of Malta. Here, the crew of the German expedition ship “Sonne” wants to track down mysterious freshwater deposits in the Mediterranean.

Next up is Peru where, in a bid to counteract the threat of water shortages, work is underway on projects that use ancient Incan methods.