A team of 10 climbers, including an American, is missing after an avalanche on Broad Peak in Pakistan's Karakoram mountain range, says the Alpine Club of Pakistan.
The hunt is on to find three climbers who disappeared while trying to get to the top of New Zealand's tallest mountain, authorities said.
The climbers faced thirst and hunger in frigid temperatures for 80 hours.
The newly mapped underwater mountain is bigger than Mount Olympus in Greece, which is 2,917 meters (9,570 feet) high.
A worker on an office hiking retreat to a national forest in Colorado had to be rescued after 14 of his colleagues allegedly left him stranded on a 14,230-foot mountain, authorities said.
Investigators said they were stranded in the snow at 9,000 feet near the top of Mount Baldy on Bear Canyon Trail. After several hours, the hikers had to call 911 for help.