It's reported the 5-acre glacial lake was there in March- gone in May. Rangers at one of Chile's national parks there said all they found in late May was "a 100-foot-deep crater" where the lake had been. With no lake to feed it- a river that drained lake water was virtually empty. Though no earthquakes have occurred in the area- scientists are speculating fissures may have developed in the bottom of the lake and drained it.
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