But when the question of how to explore the lake came up, not long after its discovery, the Vostok scientists faced a serious dilemma. The lake is under immense pressure, and to breach the ice would have devastating consequences.
Roger Federer: Swiss star will play on until at least 2019. Updated 1815 GMT (0215 HKT) February 21, 2017. Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.
LONDON -- Like the patch of scorched earth around the baselines of Centre Court, Roger Federer's nearly 35-year-old body isn't quite what it used to be. Thirteen years ago, he won his first Grand Slam singles title here at the All England Club, and then, nine years later, his most recent. In the four years since, Federer's has become increasingly fragile, at times even brittle, despite reaching the final here the past two years.