After Medusa and Ojos I was finally well acclimatized.
Made a high camp above the bowl-like valley, at about 5850 m.
Took the crater-rim route, descended by the normal via the col. Very unique summit, took a little time to find the highest tower.
Summited with Radek (brade) and Darek. Probably the first Polish ascent.
We climbed Walter Penck via the el Arenal normal route. it's now possible to reach El Arenal with an acceptable though very rough 4WD track leading up to El arenal BC at 5500m, close to Laguna Penck which makes the climb very convenient and easy if.... well acclimatized!
Javier Aguileira, Ursula Diaz, Jean Louis Parent, François Solignac and me reached the summit around 14h20 having left high camp at 5920 around 8.40 am. It was a very easy climb (crampons were not needed). the highest top is one of the few rocky summits (on the left - west, when you access the main summit area from the coil between south and west summit) My GPS reading was slightly higher than expected with 6686m and an air pressure level of only 453 hpa). Nice view and peak.
It's quite likely tyhe new 4WD approach to el arenal on the argentinina side will probably make this mountain more accessible and more often climbed in the future.
Our favourite of 5 6,000ers we climbed near El Arenal. Camped at 5,700m on the eastern side of the mountain then followed the canaleta to the top. Very little snow around. The top is a fascinating jumble of rocky pinnacles, and the views are great.
More information on our blog: http://pikesonhikes.blogspot.com/2011/01/cazadero-walter-penck-6684m-provincia.html
Climbed WP in one long day from El Arenal. Routefinding near the base was somewhat challenging in the dark (alpine start). Once I figured out where I was, I pretty much went straight up the Canaleta. I used an ice axe, but no crampons. The snow was junky, postholing through soft snow and smashing my knees on rocks / icy penitentes. Fortunately, most of the snow was avoidable and/or not very deep. Great views from the top, in fact everywhere in that basin between Ojos del Salado and Walter Penck is quite remarkable. Nice, obscure climb.