The chamber is a semicircular enclosure in its first part, which is lengthened into a narrow ascending gallery. The main axis is a little more than 10 metres long and the widest part of the semicircular entrance has 3.50 m.
The figures can be found spread out over almost all the enclosure, although the long narrow part groups together the largest number of figures. It refers to a collection of deer painted in red, using a technique of juxapositioned spots, and occasionally more isolated spots.
The figures measure between 40 and 85 cm in length. These figures have lost much of their original condition. The rock supporting them is particularly fissured and the growth of crystals between the fissures makes the rock flake easily, taking the paint with it. The existence of a quarry in the surrounding area with the resulting vibrations in the rock, increase this paint loss action.
These red deer figures, made with the same technique of marking spots, can also be seen in other sanctuaries on the Cantabria area such as Covalanas (Ramales de la Victoria), and La Pasiega (Puente Viesgo). They are considered to belong to a previous Magdalenian phase than the phase when Santimamiñe, Ekain and Altxerri were decorated.
