Sansanet is a little parking at North of the col de Somport between Spain and France. It's signaled in the road but you must be carefull driving slowly because it's after a curve.
In the parking you see the signal to Ibón de Estanés, following the path crossing the bridge to reach finally the G.R.-11 and the path of camille that come from the ski-resort of Candanché (be careful with this crosspath in the return). Across Puerto de Estanés you reach the big lake. Now you follow the paint red and white of G.R.-11 in left side bordering the lake to one point where you see thr marks of a short path (yellow and green) turning to left side to reach a important col in left side. In right side (South) is the long ramp to walk to the enter to the Valle de los Sarrios, a spectacular cirque of peaks with range of Bernera in front of you.
You must cross now all the green field (it was a lake in old times) to the end turning to right side to reach the Puerto de Bernera. In left side you can see the big peak of Bisaurin but in right side is Cúpula de Secús. You must walk following initially the paint red and white leaving to walk in direction to the pre-summit of Cúpula de Secús walking a steepy ramp of rock and grass. The last section is rocky and you must search in left side a chimney to use the hands in a easy rock-climbing (I+) to reach te summit.