Although near the surface (the highest point of this chamber is 5 metres from the exterior), we have to carry out two small abseils from Herensugearen gotorlekua to reach it.

This made it impossible to build a walkway without damaging certain areas of the cave. The spacious chamber slopes upwards and, in this case as well, the chamber's name comes from an interesting geological formation that looks like the helmet of a mediaeval warrior.

The chamber is 55 metres long and up to 20 metres wide and it is just as rich in geological formations as the previous two chambers.