270m, 10 pitches.
The obvious chimney in the top of the wall opposite the North face of the Pison is gained from the right. One pitch (the third) of 6b is short and steep, the rest is 4 and 5. Pitch 4 ends in a cave / niche obviously used by vultures. Perhaps best avoided in the nesting season? A superb adventure!
A. Rabadá, Rafael Montaner 27/Mar/1959