A mysterious hole 80,000 square kilometres in diameter opens up in the Antarctica
Scientists say it's the first time a hole of this magnitude has been observed in the Weddell Sea in over 40 years. In their observations, it has fluctuated in size up to a maximum of nearly 80,000 square kilometers.
In 1974, an even bigger hole in the ice - 250,000 square kilometers - opened in the same location.
Now researchers are trying to figure out why it recurred.
"We don't really understand why it went away for 40 years and has come back now," Kent Moore, professor of physics at the University of Toronto, told CBS News. "It's like an enigma on many levels."