Shira Camp (12,300') to Barranco Camp (12, 800'). The hike today was brutal. The oxygen level in the air decreased substantially. I felt out of breath and had a slight headache as we hiked to about 14,200' in the early afternoon. I took Diamox in the morning to alleviate the headache associated with high altitude sickness. It helped. But since Diamox was diuretic, I was on the constant lookout for that big rock or big bush to hide behind to answer the call of nature. After lunch we had the option of continuing to Lava Tower (15,000', close to the rockslide
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