Nine members of an Antarctic expedition are locked up together at a research station 2,000 miles from civilization. And one of them is a madman — accused of violently beating, threatening and sexually harassing at least two of his teammates. The Post can reveal that the South African crew of three women and six men includes a glamorous doctor with her own skincare line and a deputy team leader who helped produce a short horror film during a previous stay at the station — along with engineers and a meteorologist. The identity of the crew member believed to have snapped...