Mountaineer Nirmal Purja's last post explained why he chose Broad Peak despite initially planning another climb. "Just before setting off for Pakistan, I ran the numbers on my 8000m summits...It hit me: if I tick off Broad Peak...only one remains 'Cho Oyu'," he wrote. "Then I become the first person...to climb all 14 eight-thousanders twice. Without oxygen," Purja had added.