LONDON - British scientists have begun drilling through the Antarctic ice in the hope of finding extreme life forms in a hidden lake. The team of 12 scientists is using hot water to melt a borehole through 3km of the ice sheet to reach Lake Ellsworth. The freshwater has been sealed off by the ice sheet for up to half a million yrs, and is kept liquid by the warmth of the bedrock. Scientists hope to find microbes that somehow survive in the cold water with few nutrients.