On June 4, southern Chile’s Puyehue volcano erupted for the first time in 50 years. It’s been spewing giant ash clouds ever since. Enough ash, it seems, to make the Nahuel Huapi Lake in neighbouring Argentina an unrecognizable, soot-covered abyss, as you’ll see in the above video of one diver’s attempt to sift through it all. [via The Telegraph]
Just like when photographers use a piece of white paper to calibrate their cameras, British scientists are using this dried-out Turkish lake to set the white balance of Earth observation satellites.