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First, the team identified a depression or "doline" in the ice surface that had formed by a previous lake drainage event where they thought meltwater was likely to pool again on the ice.

Around the doline, the team installed high-precision GPS stations to measure small changes in elevation at the ice's surface, water-pressure sensors to measure lake depth, and a timelapse camera system to capture images of the ice surface and meltwater lakes every 30 minutes.

“You have to pass by him in order to work in the Médina,” one of the street artists, Doline Legrand Diop, said.

In formation it resembles the limestone Alps of Tirol and there are on its elevated plateaus a number of doline or funnel-shaped depressions into which the melted snow and the rain sink.