We didnt take anything, and even went to 5600 meter with the car. Just felt a bit weak from time to time. And sometimes a bit headache coming up, then you can decide to go forward to lower area again.
Just dont make a huge step in the altitude you sleep at!
Dont sleep at 4000 meter when before you were sleeping at 2000 meter, you probably get a huge headache
Sounds like the Swiss couple was already to far and unable to take the right decision.
|