A big part of the trek to base camp is to start the acclimatisation process. Above 4000m more and more people show signs of acute mountain sickness ( the pre cursor to PULMONARY EDEMA or CEREBRAL EDEMA for those that have seen the Discovery Channel documentary). Our group has not been doing too badly so far. Some headaches, nausea, sleep apnea, and dizziness but nothing serious. Drinking 6 litres of water a day helps to keep things in check as well as gaining vertical metres slowly. So far, I have been fine but there is still a long way to go! As part of the acclimatisation process we will climb Lobuche Peak -around 6100m (see attached) and try to sleep on the summit. this should help speed up our travels through the dangerous Khumbu Ice Fall on our return to base camp.