Last hiking in Chile

4 day trip up north to Antofagasta and then Socaire. Lots of instant soup and ramen and chocolate. rock climbing and a couple of hikes. The second peaked at 5020 meters/ 16,470 feet. Pretty high. I got altitude sickness at 4350 meters and had to return. We got up at 3am, left camp at 4, and started trekking at 5, about two hours in the dark with only the light of our lanterns and the full moon which didn't set until about 10 or 11am. Everything froze, including my water bottle on my waist. I'm not sure the coldest it got, but at 9am it was -4 celsius (about 25?). The water I tried to wash the plates with froze on the plate... Incredibly beautiful, colors, the pure white of the salt flats and the driest desert in the world. Headache the entire weekend (base camp at 3300 meters). A geologist's dream.