An international team of scientists led by the UK has been given the go-ahead to explore one of the planet's last great frontiers - an ancient lake hidden deep beneath Antarctica's ice sheet. Buried under 3 km of ice, the lake - the size of Lake Windermere (UK) - may have been isolated for hundreds of thousands of years and could contain unique forms of life. The team hopes the exploration will yield vital clues about life on Earth, climate change and future sea-level rise.