Hi and welcome to the Fifth video in my Everest adventure series. Moving from camp 3 to camp 4 is a slow and painful process due to the lack of oxygen. The higher we go the harder it will become. Above camp 3 we start to breathe supplemental oxygen, but this does not eliminate all your problems. The oxygen gives you a boost, but climbing is still extremely difficult. In this video, you can see how slowly the climbers are moving. This is pretty much full speed on Everest.