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.
Maestro Roger Federer Â· January 30 at 4:22am Â· Roger Federer: What was so special with this win is that I could defend my title at a Grand Slam, I realized that this happened for the last time with US Open 2007-2008