A general view of lake Laguna

A general view of lake Laguna 513, at more than 13,000 feet above sea level in front of the Hualcan glacier in Huascaran natural reserve in Ancash. Scientists warn that if a giant chunk of ice from the Hualcan glacier breaks off it could trigger a tsunami-like wave in Laguna 513 and send a lethal torrent of water cascading down the valley.