The way I processed Nims' project -
He set a goal that appeared to everyone laughably impossible - regardless of climbing style - and nailed it. To accomplish it, he needed:
a) Some unreal endurance outputs for the various climbs. Taken as a whole across the 7 months, I have to think it is one of the greatest
athletic achievements our sport has seen, setting aside the climbing style. Surely his body was operating near the threshold of its potential, then repeat, and repeat...
b) Really really really really REALLY good luck. Weather, avy, icefall, weather, route conditions, logistics, weather, etc.
c) Great support and assistance from his sherpa climbing companions, sponsors, donors, logistics (it looked earlier in the year like he was doing most of this himself, but maybe it spread out eventually?).
d)O's on all the peaks, typically standard routes, and fixed lines/helis/broken routes on some peaks. Hitting the goal was...the goal. This mean that on some peaks they were the workhorses, on some peaks they were the beneficiaries of other's work.
I am a pretty nerdy armchair adventurer of high altitude mountaineering (aren't we all on this thread)...so when I first heard about Nim's Project Possible, I sniffed at the O's and fixed lines etc. and thought what Boukreev or Messner or House would think of this as a climbing feat. But as time went on, I thought of it in a different light...more as a high altitude (incredibly risky) FKT, with an acknowledgement that avoiding mountaineering purity was not to make it "easy" the way it often is, but to accomplish an even
more difficult goal. In other words, I'm not convinced (but would be interested to hear) if any other high altitude mountaineer in the world post-Steck could pull this off if they had the budget and time: Is there anyone else with the determination, ability to recover, endurance, and fearlessness to jump from Annapurna to Dhaulagiri in 2.5 weeks? Or NP, Gash 1&2, K2, & Broad Peak in a month?
So yes I think it's apples and oranges from Messner and Habler, but I think it ranks in the very top mountaineering feats of all time. And, for what it's worth, Messner donated to Nims to get the project done
