Four climbers and two guides who went missing last week almost 13,000 feet up Mount Rainier are now presumed dead after rescuers found their gear at the bottom of a 3,000-foot drop in an area prone to avalanches, reports NBC. "There is every indication there is not a viable chance of survival," says a Mount Rainier National Park ranger, calling the area "incredibly hazardous. We are not able to get into that area; it would put our staffers on the ground at risk." The group last made contact via sat phone at 6pm Wednesday; a search began midday Friday when no further contact had been made. Helicopter crews spotted the gear from the air yesterday. (More Mt. Rainier stories.)