At a tiny outpost in the middle of Antarctica, Russian scientists are poised to become the first humans to reach a massive liquid lake that has been cut off from the sunlit world for millennia, and may house uniquely adapted life forms that are new to science.    

Researchers are racing against the fast-approaching bitter cold and total darkness of Antarctic winter to complete a drill hole to Lake Vostok, one of the largest lakes on Earth, and the largest of the nearly 400 ice-buried lakes discovered on the frigid continent so far.

It's an effort that began more than 10 years ago, and one that has been plagued by difficulties — and this season, the stakes are higher than ever. If they don't reach the lake before they are forced to leave for the winter, the Russian team will be forced to wait two more years to sample water from the lake, and discover what may be living in it.

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