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.
Switzerland's Roger Federer plays a shot during his men's singles match against Britain's Andy Murray on day ten of the 2014. Tennis star Roger Federer's wife Mirka has given birth to the couple's SECOND set of twins. The two boys, Leo and Lenny, join Federer's four-year-old twin girls, Myla Rose and Charlene Riva. The Swiss 17-times grand slam singles champion has defied the odds with his incredible skill on the tennis court on many occasions. But the odds of having two sets of twins are a staggering 1 in 700,000.