Green Boots joined the ranks of roughly 200 corpses remaining on Everest by the early 21st century. It is unknown when the term Green Boots entered Everest parlance. Over the years it became a common term, as all the expeditions from the north side encountered the body of the climber curled up in the limestone alcove cave. The cave is at 27,890 feet (8,500 m) and is littered with oxygen bottles. It is below the first step on the path.