Late last night after making the summit of K2, the climbers reached the bivouac at about 8300m that they had stayed the night in before. Three of the climbers – Darek Zaluski, Maxut Zumayev and Vassily Pivtsov – were considering whether to stay there for the night or head to camp 4. Gerlinde Kaltenbrunner had made up her mind and headed to camp 4.
They had been climbing in the dark for a number of hours when they reached the bivouac tent. Zumayev and Pivtsov had reached the summit of K2 just after the sun set.
Source: Gerlinde Kaltenbrunner
Below is screen shot of where Zumayev was located late last night.