- A YouTube video shows the scale of an avalanche on Mount Everest on Saturday
- Eight Nepalis are dead at Everest, but not identified; three Americans are also dead
- Helicopter rescues are underway to retrieve climbers stranded on Everest
(CNN)A mammoth wave of snow darkens the sky over Everest Base Camp. Appearing like a white mushroom cloud roaring over the climbers, they scurry as their tents flap like feathers in the wind. Then panic hits.