Xinhua: Scientists in search of clues to climate change have begun an exploration of a lake that lies deep beneath an Antarctic ice sheet. While an estimated 150 lakes have been discovered beneath the region, initial tests have revealed Lake Ellsworth has a depth of roughly 350 feet, making it an ideal spot to investigate microbial life and recover climate records, the researchers claim. "We are particularly interested in Lake Ellsworth because it’s likely to have been isolated …