The glaciers are losing water at an alarming rate as the heatwave drags on.
According to the Swiss Glacier Monitoring Network, roughly 400 cubic metres of water are flowing off the ice every second.
That's enough to fill an Olympic swimming pool every six seconds, day and night.
Network head Matthias Huss calls prolonged heatwaves the "worst-case scenario" for glaciers, with this June's two-week stretch exceptional even by recent standards.
Switzerland is warming twice as fast as the global average — more than 1,100 of its glaciers have already disappeared since the early 1970s.
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