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.
Rafael Nadal beat Roger Federer the last time they played in Miami, in 2011. Roger Federer will try to beat Rafael Nadal for the fourth consecutive time on Sunday during the Miami Open presented by Itau final. Roger Federer will go for his third Miami Open presented by Itau title on Sunday against Rafael Nadal.