Scientists in Chile are investigating the sudden disappearance of a glacial lake in the south of the country.
When park rangers patrolled the area in the Magallanes region in March, the two-hectare (five-acre) lake was its normal size, officials say.
But last month they found a huge dry crater and several stranded chunks of ice that used to float on the water.
One theory is that an earthquake opened up a fissure in the ground, allowing the lake's water to drain through.
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