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.
About Roger Federer. Swiss professional tennis player and World No. 1 Roger Federer has an estimated net worth of $400 million in 2016. His 17 Grand Slam singles titles have made him the dominant male player of his time and one of the greatest of all times.