The main route starts at the bottom of the cave, in which case it supposedly goes at at 13b, or at 13a you can traverse into it from the start of Cantxaca (what I did). In this case, the first 3 clips are easy, and then a tricky traverse with small holds leads you into the main steep route. Go past tufas for another three bolts at 5.12 to a semirest on a decent hold. The crux is then a big move with your feet at the bolt. After that you move on into a big hole where I could get a kneebar rest before clipping the final bolt and finishing the climb.