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.
For the third time in their last three events, No. 1 Novak Djokovic and No. 2 Roger Federer will meet in a tournament final, this for the all the marbles at the biggest hardcourt tennis event on the planet, the US Open. Looking back, Wimbledon was Federerâs surface and he lost.